Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Additional Information (Details)

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Real Estate and Intangible Assets - Additional Information (Details)
 3 Months Ended 9 Months Ended 14 Months Ended 61 Months Ended
Aug. 30, 2018
USD ($)
a
Aug. 28, 2018
USD ($)
a
Jul. 10, 2018
USD ($)
a
Jun. 11, 2018
USD ($)
a
Jun. 07, 2018
USD ($)
a
Jun. 01, 2017
lease
Sep. 30, 2018
USD ($)
a
Mar. 31, 2018
USD ($)
lease
farm
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
a
Sep. 30, 2018
USD ($)
a
tenant
region
farm
Sep. 30, 2017
USD ($)
a
farm
Sep. 30, 2018
USD ($)
a
Jun. 30, 2022
USD ($)
Real Estate Properties [Line Items]                            
Number of farms | farm                     82 72    
Depreciation expense             $ 2,100,000     $ 1,700,000 $ 6,000,000 $ 4,400,000    
Tenant improvements, net of depreciation             2,300,000       2,300,000   $ 2,300,000  
Tenant improvements, depreciation and rental revenue             77,000     61,000 228,000 150,000    
Amortization expense related to intangible assets             289,000     390,000 835,000 739,000    
Amortization of acquired above market lease values and deferred revenue             2,000     4,000 5,000 7,000    
Total accretion related to below-market lease values and deferred revenue             17,000     17,000 50,000 47,000    
Operating revenues             8,013,000     6,561,000 21,333,000 18,302,000    
Number of leases | lease           2                
General and administrative expenses             $ 443,000     $ 386,000 $ 1,350,000 $ 1,227,000    
Area of real estate property (in acres) | a             67,826     61,794 67,826 61,794 67,826  
Proceeds from dispositions of real estate assets                     $ 132,000 $ 0    
Property and casualty loss             $ 0 $ 129,000   $ 0 $ 129,000 $ 0    
Cost to repair damaged properties               81,000            
Capitalized real estate addition               34,000            
Repairs and maintenance expense               $ 47,000            
Number of tenants | tenant                     56      
Percent of rental revenue (as percent)                     100.00% 100.00%    
Tenant A                            
Real Estate Properties [Line Items]                            
Number of farms | farm                     5      
Operating revenues                     $ 3,300,000      
Percent of rental revenue (as percent)                     15.60%      
California                            
Real Estate Properties [Line Items]                            
Number of farms | farm                     31 27    
Operating revenues                     $ 9,880,000 $ 8,749,000    
Area of real estate property (in acres) | a             8,435     7,921 8,435 7,921 8,435  
Expended or accrued for capital improvements                         $ 1,000,000  
Percent of rental revenue (as percent)                     46.30% 47.80%    
Number of regions farms are located | region                     4      
Florida                            
Real Estate Properties [Line Items]                            
Number of farms | farm                     22 17    
Operating revenues                     $ 5,790,000 $ 4,839,000    
Area of real estate property (in acres) | a         26   17,184     11,225 17,184 11,225 17,184  
Proceeds from dispositions of real estate assets         $ 132,000                  
Percent of rental revenue (as percent)                     27.10% 26.50%    
Florida | Forecast                            
Real Estate Properties [Line Items]                            
Operating revenues                           $ 302,000
Morrow County Oregon                            
Real Estate Properties [Line Items]                            
Area of real estate property (in acres) | a     1,895                      
Proceeds from dispositions of real estate assets     $ 20,500,000                      
Closing costs and write-off of deferred rent     154,000                      
Gain (loss) on sale of farm     $ 6,400,000                      
Cochise County, Arizona                            
Real Estate Properties [Line Items]                            
Number of farms | farm               2            
Number of leases | lease               2            
Lease term (in years)               1 year            
Aggregate minimum rents               $ 480,000            
Decrease in rental income               $ 203,000            
Decrease in rental revenue (as percent)               29.70%            
Deferred rent liability               $ 84,000            
General and administrative expenses                 $ 50,000          
Ventura County California                            
Real Estate Properties [Line Items]                            
Decrease in rental income $ 62,000     $ 91,000                    
Decrease in rental revenue (as percent) 16.20%     12.00%                    
Operating lease, term (in years)       10 years                    
Area of real estate property (in acres) | a 164     169                    
Annualized straight-line rent       $ 667,000                    
Income tax benefit relating to lease       $ 112,000                    
Santa Cruz County California                            
Real Estate Properties [Line Items]                            
Decrease in rental income   $ (41,000)                        
Decrease in rental revenue (as percent)   (26.00%)                        
Operating lease, term (in years)   10 years                        
Area of real estate property (in acres) | a   72                        
Annualized straight-line rent   $ 200,000                        
2018 New Real Estate Activity                            
Real Estate Properties [Line Items]                            
Number of farms | farm                     10      
Operating revenues             $ 554,000       $ 603,000      
Earnings (loss) recognized             $ (168,000)       $ (140,000)      
Area of real estate property (in acres) | a             6,735       6,735   6,735  
2017 New Real Estate Activity                            
Real Estate Properties [Line Items]                            
Number of farms | farm                       14    
Operating revenues                   $ 1,500,000   $ 3,000,000    
Earnings (loss) recognized                   $ 341,000   $ 1,200,000    
Area of real estate property (in acres) | a                   11,202   11,202    
2017 New Real Estate Activity | Florida                            
Real Estate Properties [Line Items]                            
Expended or accrued for capital improvements               $ 748,000