Quarterly report pursuant to Section 13 or 15(d)

Equity - Additional Information (Details)

v3.20.1
Equity - Additional Information (Details)
 1 Months Ended 3 Months Ended 12 Months Ended 36 Months Ended
Apr. 03, 2020
USD ($)
$ / shares
shares
Mar. 06, 2020
security
Mar. 05, 2020
USD ($)
shares
Feb. 20, 2020
$ / shares
shares
May 31, 2018
$ / shares
shares
Apr. 12, 2017
USD ($)
security
May 06, 2020
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Apr. 08, 2020
$ / shares
Feb. 19, 2020
shares
Dec. 31, 2018
shares
Aug. 07, 2015
USD ($)
Subsidiary, Sale of Stock [Line Items]                              
Stock authorized and unissued (in shares) | shares       26,000,000                      
Common stock, shares authorized (in shares) | shares       65,500,000       65,522,353   91,514,600 65,522,353   91,500,000    
Preferred stock, liquidation value | $               $ 149,400,000   $ 118,900,000 $ 149,400,000        
Common stock, par value (in dollars per share) | $ / shares               $ 0.001   $ 0.001 $ 0.001        
Common stock, shares issued (in shares) | shares               21,346,458   20,936,658 21,346,458        
Common stock, shares outstanding (in shares) | shares               21,346,458   20,936,658 21,346,458        
Proceeds from issuance of preferred and common equity | $               $ 35,589,000 $ 18,482,000            
Redemptions of Series B Preferred Stock | $               185,000 $ 13,000            
2017 Registration Statement                              
Subsidiary, Sale of Stock [Line Items]                              
Maximum number of securities that can be sold (in securities) | security           2                  
Proceeds from issuance of preferred and common equity | $                     $ 117,400,000        
2020 Registration Statement                              
Subsidiary, Sale of Stock [Line Items]                              
Maximum number of securities that can be sold (in securities) | security   2                          
Allowance for credit loss, writeoff | $               $ 21,000              
Common Stock                              
Subsidiary, Sale of Stock [Line Items]                              
Common stock, shares outstanding (in shares) | shares               21,346,458 18,462,219 20,936,658 21,346,458     17,891,340  
Common Stock | 2017 Registration Statement                              
Subsidiary, Sale of Stock [Line Items]                              
Common stock, shares issued (in shares) | shares               9,495,834     9,495,834        
Securities allowed for issuance (amount up to) | $           $ 300,000,000                  
Shares of common stock issued (in shares) | shares                     1,215,565        
Common Stock | 2020 Registration Statement                              
Subsidiary, Sale of Stock [Line Items]                              
Securities allowed for issuance (amount up to) | $           $ 1,000,000,000                  
Series B Preferred Stock                              
Subsidiary, Sale of Stock [Line Items]                              
Preferred stock, shares authorized (in shares) | shares               6,477,647   6,485,400 6,477,647        
Preferred stock, par value (in dollars per share) | $ / shares               $ 0.001   $ 0.001 $ 0.001        
Preferred stock, shares issued (in shares) | shares               5,977,647   4,755,869 5,977,647        
Preferred stock, shares outstanding (in shares) | shares               5,977,647   4,755,869 5,977,647        
Series B Preferred Stock | 2017 Registration Statement                              
Subsidiary, Sale of Stock [Line Items]                              
Proceeds from issuance of preferred and common equity | $                     $ 147,500,000        
Series B Preferred Stock | Preferred Stock                              
Subsidiary, Sale of Stock [Line Items]                              
Dividend rate (as percent)         6.00%                    
Preferred stock, shares outstanding (in shares) | shares               5,977,647 1,891,709 4,755,869 5,977,647     1,144,393  
Average sales price of common stock sold (in dollars per share) | $ / shares         $ 25                    
Stock redeemed (in shares) | shares               7,753 600            
Redemption price (in dollars per share) | $ / shares               $ 23.92 $ 22.50   $ 23.92        
Redemptions of Series B Preferred Stock | $               $ 185,000 $ 13,000            
Maximum amount of securities can be sold under shelf registration statement | shares         6,000,000                    
Gross proceeds | $               30,148,000 18,482,000            
Net proceeds from issuance of stock | $               $ 27,664,000 $ 16,828,000            
Series B Preferred Stock | Preferred Stock | 2017 Registration Statement                              
Subsidiary, Sale of Stock [Line Items]                              
Common stock, shares issued (in shares) | shares               6,000,000     6,000,000        
Series B Preferred Stock | Preferred Stock | Series B Termination                              
Subsidiary, Sale of Stock [Line Items]                              
Securities allowed for issuance (amount up to) | $     $ 147,500,000                        
Maximum amount of securities can be sold under shelf registration statement | shares     6,000,000                        
Gross proceeds | $     $ 133,500,000                        
Net proceeds from issuance of stock | $     $ 1,500,000                        
Series C Preferred Stock | Preferred Stock                              
Subsidiary, Sale of Stock [Line Items]                              
Dividend rate (as percent)       6.00% 6.00%                    
Preferred stock, shares authorized (in shares) | shares       120,000                      
Preferred stock, par value (in dollars per share) | $ / shares       $ 0.001                      
Average sales price of common stock sold (in dollars per share) | $ / shares       $ 25.00       $ 25.00     $ 25.00        
Maximum amount of securities can be sold under shelf registration statement | shares       400,000                      
Sale of stock pursuant to DRIP (in dollars per share) | $ / shares       $ 22.75                      
Common Stock | ATM Program                              
Subsidiary, Sale of Stock [Line Items]                              
Gross proceeds | $               $ 5,441,000              
Net proceeds from issuance of stock | $               $ 5,386,000              
Common stock, value authorized | $                             $ 30,000,000.0
OP Unit Holder                              
Subsidiary, Sale of Stock [Line Items]                              
Company's ownership percent (as percent)               98.70%   98.60% 98.70%        
Minimum period required to exercise, in months               12 months              
Gladstone Land Limited Partnership                              
Subsidiary, Sale of Stock [Line Items]                              
OP units held by non-controlling limited partners (in shares) | shares               288,303   288,303          
Subsequent Event | Series B Preferred Stock | Preferred Stock                              
Subsidiary, Sale of Stock [Line Items]                              
Shares of common stock issued (in shares) | shares             400                
Redemption price (in dollars per share) | $ / shares             $ 22.50                
Redemptions of Series B Preferred Stock | $             $ 9,000                
Subsequent Event | Series C Preferred Stock | Preferred Stock                              
Subsidiary, Sale of Stock [Line Items]                              
Preferred stock, shares authorized (in shares) | shares 20,000,000                            
Proceeds from issuance of preferred and common equity | $             $ 355,000                
Average sales price of common stock sold (in dollars per share) | $ / shares $ 25.00                            
Redemption price (in dollars per share) | $ / shares                       $ 22.50      
Maximum amount of securities can be sold under shelf registration statement | shares 26,000,000           26,000,000                
Gross proceeds | $ $ 636,500,000                            
Net proceeds from issuance of stock | $ $ 591,500,000                            
Sale of stock pursuant to DRIP (in dollars per share) | $ / shares $ 22.75