Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Operating Obligations (Details)

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Commitments and Contingencies - Operating Obligations (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
a
Dec. 31, 2018
a
Loss Contingencies [Line Items]    
Total Acres | a 86,535 73,205
Ventura, California    
Loss Contingencies [Line Items]    
Total Acres | a 413  
Amount Expended or Accrued as of December 31, 2019 $ 664,000  
Madera, California    
Loss Contingencies [Line Items]    
Total Acres | a 928  
Total Commitment $ 500,000  
Amount Expended or Accrued as of December 31, 2019 $ 402,000  
Hillsborough, Florida    
Loss Contingencies [Line Items]    
Total Acres | a 55  
Total Commitment $ 2,250,000  
Amount Expended or Accrued as of December 31, 2019 $ 0  
Cochise, Arizona | Group One    
Loss Contingencies [Line Items]    
Total Acres | a 1,761  
Total Commitment $ 1,820,000  
Amount Expended or Accrued as of December 31, 2019 0  
Payments for capital improvements $ 1,300,000  
Cochise, Arizona | Group Two    
Loss Contingencies [Line Items]    
Total Acres | a 1,239  
Total Commitment $ 1,360,000  
Amount Expended or Accrued as of December 31, 2019 0  
Payments for capital improvements $ 860,000  
Van Buren, Michigan    
Loss Contingencies [Line Items]    
Total Acres | a 119  
Total Commitment $ 150,000  
Amount Expended or Accrued as of December 31, 2019 $ 0  
Columbia, Oregon    
Loss Contingencies [Line Items]    
Total Acres | a 200  
Total Commitment $ 1,800,000  
Amount Expended or Accrued as of December 31, 2019 $ 1,146,000  
Collier & Hendry, Florida    
Loss Contingencies [Line Items]    
Total Acres | a 5,630  
Total Commitment $ 2,000,000  
Amount Expended or Accrued as of December 31, 2019 $ 0  
Salinas, California    
Loss Contingencies [Line Items]    
Total Acres | a 324  
Total Commitment $ 100,000  
Amount Expended or Accrued as of December 31, 2019 $ 1,000