Annual report pursuant to Section 13 and 15(d)

Real Estate and Intangible Assets - 2016 Acquisitions (Details)

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Real Estate and Intangible Assets - 2016 Acquisitions (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
a
farm
Dec. 31, 2016
USD ($)
a
farm
option
transaction
shares
Dec. 31, 2015
USD ($)
Nov. 30, 2017
a
Real Estate Properties [Line Items]        
Number of farms | farm 73 58    
Total Acres | a 63,014 50,592    
New Long-term Debt Issued $ 302,988,000      
Payments of stock issuance costs 1,977,000 $ 272,000 $ 1,482,000  
Rental revenue $ 25,111,000 $ 17,306,000 $ 11,888,000  
Hillsborough, FL        
Real Estate Properties [Line Items]        
Total Acres | a       219
2016 New Real Estate Activity        
Real Estate Properties [Line Items]        
Number of farms | farm   15    
Number of separate transactions | transaction   9    
Total Acres | a   33,780    
Total Purchase Price   $ 99,722,000    
Acquisition Costs   496,000    
New Long-term Debt Issued   32,853,000    
Acquisition costs, period cost   206,000    
Rental revenue   2,600,000    
Real estate properties earnings recognized   196,000    
2016 New Real Estate Activity | Leasehold interests – land        
Real Estate Properties [Line Items]        
Acquisition costs, period cost   $ 9,520    
2016 New Real Estate Activity | Gunbarrel Road | Saguache, CO        
Real Estate Properties [Line Items]        
Number of farms | farm   3    
Acquisition Date   Mar. 03, 2016    
Total Acres | a   6,191    
Lessee term   5 years    
Total Purchase Price   $ 25,736,000    
Acquisition Costs   119,000    
Annualized straight-line rent   1,591,000    
New Long-term Debt Issued   $ 15,531,000    
Number of renewal options | option   1    
Term of renewal   5 years    
Business acquisition, equity interest issued or issuable (in shares) | shares   745,879    
Business acquisition, equity interest issued or issuable, value assigned   $ 6,500,000    
Payments of stock issuance costs   $ 25,500    
2016 New Real Estate Activity | Calaveras Avenue | Fresno, CA        
Real Estate Properties [Line Items]        
Number of farms | farm   1    
Acquisition Date   Apr. 05, 2016    
Total Acres | a   453    
Lessee term   10 years    
Total Purchase Price   $ 15,470,000    
Acquisition Costs   38,000    
Annualized straight-line rent   774,000    
New Long-term Debt Issued   $ 9,282,000    
Number of renewal options | option   1    
Term of renewal   5 years    
2016 New Real Estate Activity | Orange Avenue | St. Lucie, FL        
Real Estate Properties [Line Items]        
Number of farms | farm   1    
Acquisition Date   Jul. 01, 2016    
Total Acres | a   401    
Lessee term   7 years    
Total Purchase Price   $ 5,100,000    
Acquisition Costs   38,000    
Annualized straight-line rent   291,000    
New Long-term Debt Issued   $ 3,120,000    
Number of renewal options | option   2    
Term of renewal   7 years    
2016 New Real Estate Activity | Lithia Road | Hillsborough, FL        
Real Estate Properties [Line Items]        
Number of farms | farm   1    
Acquisition Date   Aug. 11, 2016    
Total Acres | a   72    
Lessee term   5 years    
Total Purchase Price   $ 1,700,000    
Acquisition Costs   38,000    
Annualized straight-line rent   97,000    
New Long-term Debt Issued   $ 1,020,000    
Number of renewal options | option   0    
2016 New Real Estate Activity | Baca County | Baca, CO        
Real Estate Properties [Line Items]        
Number of farms | farm   5    
Acquisition Date   Sep. 01, 2016    
Total Acres | a   7,384    
Lessee term   4 years    
Total Purchase Price   $ 6,323,000    
Acquisition Costs   73,000    
Annualized straight-line rent   384,000    
New Long-term Debt Issued   $ 0    
Number of renewal options | option   1    
Term of renewal   5 years    
Business acquisition, equity interest issued or issuable (in shares) | shares   125,677    
Business acquisition, equity interest issued or issuable, value assigned   $ 1,500,000    
Payments of stock issuance costs   $ 8,235    
2016 New Real Estate Activity | Diego Ranch | Stanislaus, CA        
Real Estate Properties [Line Items]        
Number of farms | farm   1    
Acquisition Date   Sep. 14, 2016    
Total Acres | a   1,357    
Lessee term   3 years    
Total Purchase Price   $ 13,996,000    
Acquisition Costs   64,000    
Annualized straight-line rent   621,000    
New Long-term Debt Issued   $ 0    
Business acquisition, equity interest issued or issuable (in shares) | shares   343,750    
Business acquisition, equity interest issued or issuable, value assigned   $ 3,900,000    
Payments of stock issuance costs   $ 21,710    
2016 New Real Estate Activity | Nevada Ranch | Merced, CA        
Real Estate Properties [Line Items]        
Number of farms | farm   1    
Acquisition Date   Sep. 14, 2016    
Total Acres | a   1,130    
Lessee term   3 years    
Total Purchase Price   $ 13,232,000    
Acquisition Costs   42,000    
Annualized straight-line rent   574,000    
New Long-term Debt Issued   $ 0    
2016 New Real Estate Activity | Central Avenue | Fresno, CA        
Real Estate Properties [Line Items]        
Number of farms | farm   1    
Acquisition Date   Oct. 13, 2016    
Total Acres | a   197    
Lessee term   10 years    
Total Purchase Price   $ 6,500,000    
Acquisition Costs   29,000    
Annualized straight-line rent   325,000    
New Long-term Debt Issued   $ 3,900,000    
Number of renewal options | option   2    
Term of renewal   5 years    
2016 New Real Estate Activity | Horse Creek | Baca, CO        
Real Estate Properties [Line Items]        
Number of farms | farm   1    
Total Acres | a   16,595    
Lessee term   4 years    
Total Purchase Price   $ 11,665,000    
Acquisition Costs   55,000    
Annualized straight-line rent   717,000    
New Long-term Debt Issued   $ 0    
Number of renewal options | option   1    
Term of renewal   5 years    
Business acquisition, equity interest issued or issuable (in shares) | shares   233,952    
Business acquisition, equity interest issued or issuable, value assigned   $ 2,600,000    
Payments of stock issuance costs   $ 7,675    
Lease One | 2016 New Real Estate Activity | Diego Ranch | Stanislaus, CA        
Real Estate Properties [Line Items]        
Number of renewal options | option   3    
Term of renewal   5 years    
Lease One | 2016 New Real Estate Activity | Nevada Ranch | Merced, CA        
Real Estate Properties [Line Items]        
Number of renewal options | option   1    
Term of renewal   5 years    
Lease Two | 2016 New Real Estate Activity | Diego Ranch | Stanislaus, CA        
Real Estate Properties [Line Items]        
Number of renewal options | option   1    
Term of renewal   3 years    
Lease Two | 2016 New Real Estate Activity | Nevada Ranch | Merced, CA        
Real Estate Properties [Line Items]        
Number of renewal options | option   1    
Term of renewal   3 years