Annual report pursuant to Section 13 and 15(d)

Debt - Mowood/Omega Revolver/ Amended Pinedale Credit Facility (Details)

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Debt - Mowood/Omega Revolver/ Amended Pinedale Credit Facility (Details) - USD ($)
12 Months Ended
Dec. 29, 2017
Jul. 31, 2015
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2016
Mar. 30, 2016
Jul. 08, 2015
Dec. 20, 2012
Debt Instrument [Line Items]                  
Long-term debt outstanding       $ 152,109,426 $ 150,038,380        
Secured credit facilities, net       33,785,930 37,261,109        
Cash sweep provision distribution     $ 4,400,000            
Total assets       651,455,794 $ 624,883,180        
Line of Credit                  
Debt Instrument [Line Items]                  
Face amount               $ 153,000,000  
Secured Debt                  
Debt Instrument [Line Items]                  
Long-term debt outstanding       33,944,000          
Revolving Credit Facility | Line of Credit                  
Debt Instrument [Line Items]                  
Face amount               $ 105,000,000  
Revolving Credit Facility | Line of Credit | Mowood/Omega Revolver                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity   $ 1,500,000.0              
Basis spread on variable rate   4.00%              
Long-term debt outstanding       0          
Pinedale LP | Secured Term Credit Facility | Secured Debt                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity                 $ 70,000,000
Secured credit facilities, net             $ 58,500,000    
Pinedale LP | Amended Pinedale Term Credit Facility                  
Debt Instrument [Line Items]                  
Monthly principal periodic payment $ 294,000                
Debt instrument term 5 years                
Face amount $ 41,000,000.0                
Interest rate, fixed 6.50%                
Pinedale LGS                  
Debt Instrument [Line Items]                  
Total assets       $ 131,500,000          
Pinedale LGS | General Partner | Pinedale GP                  
Debt Instrument [Line Items]                  
Controlling economic interest           81.05%      
Value of economic interest             $ 47,400,000