Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
Debt - Mowood/Omega Revolver/Pinedale Credit Facility (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 29, 2017
Mar. 30, 2016
Jul. 31, 2015
Jul. 08, 2015
Mar. 07, 2014
Dec. 20, 2012
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 07, 2015
Debt Instrument [Line Items]                      
Long-term debt outstanding               $ 150,038,380 $ 152,777,437    
Secured credit facilities, net               37,261,109 40,745,354    
Cash sweep provision distribution                 4,400,000 $ 9,100,000  
Total assets               624,883,180 $ 633,418,113    
Line of Credit                      
Debt Instrument [Line Items]                      
Face amount       $ 153,000,000              
Secured Debt                      
Debt Instrument [Line Items]                      
Long-term debt outstanding               37,472,000      
Revolving Credit Facility | Line of Credit                      
Debt Instrument [Line Items]                      
Monthly principal periodic payment       900,000       1,600,000      
Face amount       $ 105,000,000             $ 93,000,000
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          
Basis spread on variable rate   1.00%                  
Monthly principal periodic payment         $ 294,000            
Required principle payment as percentage of outstanding amount, beginning in year two         0.42%            
Extension option, term           1 year          
Periodic payment through extension period             $ 3,200,000        
Secured credit facilities, net   $ 58,500,000                  
Pinedale LP | Secured Term Credit Facility | Secured Debt | LIBOR                      
Debt Instrument [Line Items]                      
Basis spread on variable rate           3.25% 4.25%        
Pinedale LP | Secured Term Credit Facility | Secured Debt | LIBOR | Maximum                      
Debt Instrument [Line Items]                      
Basis spread on variable rate   7.00%                  
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                    
Coupon rate percentage 6.50%                    
Pinedale LGS                      
Debt Instrument [Line Items]                      
Total assets               $ 137,000,000      
Pinedale LGS | General Partner | Pinedale GP                      
Debt Instrument [Line Items]                      
Controlling economic interest             81.05%        
Value of economic interest   $ 47,400,000