Annual report pursuant to Section 13 and 15(d)

Borrowings - Additional Information (Detail)

v2.4.1.9
Borrowings - Additional Information (Detail) (USD $)
12 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Dec. 31, 2014
Farm
Dec. 31, 2013
Farm
Dec. 31, 2012
Dec. 31, 2014
May 09, 2014
Sep. 29, 2014
Sep. 30, 2014
Farm
Dec. 11, 2014
Sep. 19, 2014
Nov. 30, 2002
Dec. 30, 2010
May 23, 2012
Dec. 12, 2014
Debt Instrument [Line Items]                          
Weighted average interest rate on borrowings 3.60%land_DebtInstrumentWeightedAverageInterestRate 3.60%land_DebtInstrumentWeightedAverageInterestRate 3.70%land_DebtInstrumentWeightedAverageInterestRate                    
Debt instrument interest rate Three-month LIBOR plus 3.00%                        
Expiration date of commitment May 31, 2012                        
Note payable, outstanding $ 82,417,361us-gaap_SecuredLongTermDebt $ 43,054,165us-gaap_SecuredLongTermDebt   $ 82,417,361us-gaap_SecuredLongTermDebt                  
Line of credit, carrying value 4,000,000us-gaap_LineOfCredit 100,000us-gaap_LineOfCredit   4,000,000us-gaap_LineOfCredit                  
Unamortized deferred financing costs 1,039,714us-gaap_DeferredFinanceCostsNet 309,933us-gaap_DeferredFinanceCostsNet   1,039,714us-gaap_DeferredFinanceCostsNet                  
Number of Farms 11land_NumberOfFarmsAcquired 9land_NumberOfFarmsAcquired                      
MetLife [Member]                          
Debt Instrument [Line Items]                          
Debt instrument face amount         125,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
               
Maturity Date May 09, 2014                        
New Credit Facility maximum borrowing capacity, percentage         58.00%land_DebtInstrumentMaximumBorrowingCapacityPercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
               
Loan fees aggregate amount 220,500us-gaap_DebtInstrumentFeeAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
    220,500us-gaap_DebtInstrumentFeeAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
                 
Aggregate financing costs       614,646us-gaap_DebtIssuanceCosts
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
                 
Unamortized deferred financing costs 298,614us-gaap_DeferredFinanceCostsNet
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
    298,614us-gaap_DeferredFinanceCostsNet
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
                 
Availability of credit facility 13,800,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
    13,800,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
                 
Additional availability of credit facility 1,600,000us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
                       
Farm Credit [Member]                          
Debt Instrument [Line Items]                          
Maturity Date Aug. 01, 2034                        
Blended fixed interest rate 3.53%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmCreditMember
    3.53%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmCreditMember
                 
Debt instrument covenants description A net worth value in excess of $50,000,000; and a maximum leverage ratio of equal to or less than sixty-five percent (65%).                        
Debt instrument, net worth value 50,000,000land_DebtCovenantMinimumTangibleNetWorth
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmCreditMember
    50,000,000land_DebtCovenantMinimumTangibleNetWorth
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmCreditMember
                 
Loan fees aggregate amount 78,211us-gaap_DebtInstrumentFeeAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmCreditMember
    78,211us-gaap_DebtInstrumentFeeAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmCreditMember
                 
Aggregate financing costs 126,640us-gaap_DebtIssuanceCosts
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmCreditMember
                       
Aggregate notes payable                 4,200,000us-gaap_NotesPayable
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmCreditMember
       
Additional borrowings           8,300,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmCreditMember
             
Total borrowings from credit notes payable 12,400,000us-gaap_NotesAndLoansPayable
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmCreditMember
    12,400,000us-gaap_NotesAndLoansPayable
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmCreditMember
                 
Credit notes payable interest rate there after, Description LIBOR, plus 2.875%.                        
Credit notes payable interest rate there after 2.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmCreditMember
                       
Original principal amounts as a percent of aggregate appraised value 60.00%land_OriginalPrincipalAmountsBorrowedAsPercentOfAggregateAppraisedValueOfRealProperties
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmCreditMember
    60.00%land_OriginalPrincipalAmountsBorrowedAsPercentOfAggregateAppraisedValueOfRealProperties
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmCreditMember
                 
Number of Farms             3land_NumberOfFarmsAcquired
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmCreditMember
           
Notes payable of principal and interest due period 12 months                        
Agrifinance [Member]                          
Debt Instrument [Line Items]                          
Revolving line of credit facility                   3,300,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= land_AgrifinanceMember
     
Farmer Mac Facility [Member]                          
Debt Instrument [Line Items]                          
Debt instrument covenants description A maximum leverage ratio of not more than 65%; a minimum fixed charge coverage ratio of 1.4; and a minimum tangible net worth in excess of $50,000,000 (plus a certain percentage of future equity offerings).                        
Debt instrument, net worth value 50,000,000land_DebtCovenantMinimumTangibleNetWorth
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmerMacFacilityMember
    50,000,000land_DebtCovenantMinimumTangibleNetWorth
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmerMacFacilityMember
                 
Aggregate financing costs 41,781us-gaap_DebtIssuanceCosts
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmerMacFacilityMember
                       
Additional borrowings 10,200,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmerMacFacilityMember
                       
Debt instrument, maximum leverage ratio 0.65land_DebtInstrumentMaximumLeverageRatio
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmerMacFacilityMember
                       
Debt instrument, minimum fixed charge coverage ratio 1.4land_DebtInstrumentCovenantFixedChargeCoverageRatioMinimum
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmerMacFacilityMember
    1.4land_DebtInstrumentCovenantFixedChargeCoverageRatioMinimum
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmerMacFacilityMember
                 
Percentage of outstanding bonds held by bond purchasers 110.00%land_AggregatePrincipalAmountOfOutstandingBondsPercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmerMacFacilityMember
                       
New Line of Credit [Member]                          
Debt Instrument [Line Items]                          
Maturity Date Apr. 05, 2024                        
New Line of Credit [Member] | MetLife [Member]                          
Debt Instrument [Line Items]                          
Debt instrument face amount 4,785,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
    4,785,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
25,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
               
Maturity Date Apr. 05, 2017                        
Blended fixed interest rate   3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
                     
Commitment fee on undrawn amount 0.20%land_DebtInstrumentCommitmentFeePercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
    0.20%land_DebtInstrumentCommitmentFeePercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
                 
Debt instrument interest rate Three-month LIBOR plus a spread of 2.50%                        
Minimum annualized rate 2.75%land_DebtInstrumentMinimumAnnualizedRate
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
                       
Debt instrument covenants description A debt-to-asset-value ratio of equal to or less than sixty-five percent (65%); a net worth value in excess of $50,000,000; a debt-to-two-times-net-worth ratio of equal to or less than 0.65; and a rental-revenue-to-debt ratio of equal to or greater than 5.0%.                        
Debt instrument, net worth value 50,000,000land_DebtCovenantMinimumTangibleNetWorth
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
    50,000,000land_DebtCovenantMinimumTangibleNetWorth
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
                 
Prior Note Payable [Member] | MetLife [Member]                          
Debt Instrument [Line Items]                          
Maturity Date Jan. 05, 2026                        
Blended fixed interest rate 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_PriorNotePayableMember
    3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_PriorNotePayableMember
                 
Commitment fee on undrawn amount 0.20%land_DebtInstrumentCommitmentFeePercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_PriorNotePayableMember
    0.20%land_DebtInstrumentCommitmentFeePercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_PriorNotePayableMember
                 
Remaining balance available to disburse under MetLife Note Payable 0land_RemainingBalanceAvailableToDisburseUnderMortgageLoan
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_PriorNotePayableMember
    0land_RemainingBalanceAvailableToDisburseUnderMortgageLoan
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_PriorNotePayableMember
                 
Prior Note Payable [Member] | MetLife [Member] | Maximum [Member]                          
Debt Instrument [Line Items]                          
Debt instrument face amount                     45,200,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_PriorNotePayableMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Prior Line of Credit [Member] | MetLife [Member]                          
Debt Instrument [Line Items]                          
Debt instrument face amount                       4,800,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_PriorLineOfCreditFacilityMember
 
Maturity Date Apr. 05, 2017                        
Mortgage Note Payable [Member] | MetLife [Member]                          
Debt Instrument [Line Items]                          
Debt instrument face amount 45,200,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
    45,200,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
100,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
               
Maturity Date Jan. 05, 2026                        
Blended fixed interest rate 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
  3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
                 
Commitment fee on undrawn amount 0.20%land_DebtInstrumentCommitmentFeePercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
    0.20%land_DebtInstrumentCommitmentFeePercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
                 
Period for interest rate adjustment 3 years                        
Expiration date of commitment Dec. 31, 2016                        
Line of credit, carrying value 4,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
    4,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
                 
Mortgage Note Payable [Member] | MetLife [Member] | Maximum [Member]                          
Debt Instrument [Line Items]                          
Maturity Date Jan. 05, 2029                        
Mortgage Note Payable [Member] | Mortgage Notes and Bonds Payable [Member]                          
Debt Instrument [Line Items]                          
Aggregate fair value of mortgage notes payable outstanding 82,000,000us-gaap_LongTermDebtFairValue
/ us-gaap_LineOfCreditFacilityAxis
= land_MortgageNotesAndBondsPayableMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
    82,000,000us-gaap_LongTermDebtFairValue
/ us-gaap_LineOfCreditFacilityAxis
= land_MortgageNotesAndBondsPayableMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
                 
Mortgage notes payable, carrying value 82,400,000us-gaap_SecuredDebt
/ us-gaap_LineOfCreditFacilityAxis
= land_MortgageNotesAndBondsPayableMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
    82,400,000us-gaap_SecuredDebt
/ us-gaap_LineOfCreditFacilityAxis
= land_MortgageNotesAndBondsPayableMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
                 
Mortgage Note Payable [Member] | MetLife [Member]                          
Debt Instrument [Line Items]                          
Debt instrument face amount 100,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_NewNotesPayableMember
    100,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_NewNotesPayableMember
                 
Maturity Date Jan. 05, 2029                        
Blended fixed interest rate 3.61%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_NewNotesPayableMember
    3.61%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_NewNotesPayableMember
                 
Note payable, outstanding                         66,300,000us-gaap_SecuredLongTermDebt
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_NewNotesPayableMember
New Line of Credit [Member] | MetLife [Member]                          
Debt Instrument [Line Items]                          
Debt instrument face amount 25,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_NewLineOfCreditMember
    25,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_NewLineOfCreditMember
                 
Maturity Date Apr. 05, 2024                        
Blended fixed interest rate 2.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_NewLineOfCreditMember
    2.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_NewLineOfCreditMember
                 
Line of credit, carrying value 4,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_NewLineOfCreditMember
    4,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= land_MetlifeMember
/ us-gaap_LongtermDebtTypeAxis
= land_NewLineOfCreditMember
                 
Bonds Payable [Member] | Farmer Mac Facility [Member]                          
Debt Instrument [Line Items]                          
Debt instrument face amount 75,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmerMacFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CorporateBondSecuritiesMember
    75,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmerMacFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CorporateBondSecuritiesMember
                 
Blended fixed interest rate               3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmerMacFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CorporateBondSecuritiesMember
         
Additional borrowings               $ 3,700,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmerMacFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CorporateBondSecuritiesMember
         
Maximum loan-to-value ratio 60.00%land_LoansReceivableLoanToValueRatioMaximum
/ us-gaap_LineOfCreditFacilityAxis
= land_FarmerMacFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CorporateBondSecuritiesMember
                       
Expiration term               5 years