Annual report pursuant to Section 13 and 15(d)

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

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Debt - Mowood/Omega Revolver/Pinedale Credit Facility (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 29, 2017
Mar. 30, 2016
Jul. 31, 2015
Jul. 08, 2015
Nov. 24, 2014
Mar. 07, 2014
Dec. 20, 2012
Jul. 07, 2015
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]                      
Long-term debt outstanding                   $ 152,777,437 $ 200,632,880
Secured credit facilities, net                   40,745,354 89,387,985
Cash sweep provision distribution                   4,400,000 9,100,000
Total assets                   633,418,113 $ 650,732,571
LIBOR [Member]                      
Debt Instrument [Line Items]                      
Basis spread on variable rate         3.50%            
LIBOR [Member] | Maximum [Member]                      
Debt Instrument [Line Items]                      
Basis spread on variable rate               3.50%      
Line of Credit [Member]                      
Debt Instrument [Line Items]                      
Face amount       $ 153,000,000              
Secured Debt [Member]                      
Debt Instrument [Line Items]                      
Long-term debt outstanding                   41,000,000  
Revolving Credit Facility [Member] | Line of Credit [Member]                      
Debt Instrument [Line Items]                      
Monthly principal periodic payment       900,000           1,600,000  
Face amount       $ 105,000,000       $ 93,000,000      
Revolving Credit Facility [Member] | Line of Credit [Member] | Mowood/Omega Revolver [Member]                      
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 [Member] | Secured Term Credit Facility [Member] | Secured Debt [Member]                      
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 [Member] | Secured Term Credit Facility [Member] | Secured Debt [Member] | LIBOR [Member]                      
Debt Instrument [Line Items]                      
Basis spread on variable rate             3.25%   4.25%    
Pinedale LP [Member] | Secured Term Credit Facility [Member] | Secured Debt [Member] | LIBOR [Member] | Maximum [Member]                      
Debt Instrument [Line Items]                      
Basis spread on variable rate   7.00%                  
Pinedale LP [Member] | Amended Pinedale Term Credit Facility [Member]                      
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 Liquids Gathering System [Member]                      
Debt Instrument [Line Items]                      
Total assets                   $ 142,200,000  
Pinedale Liquids Gathering System [Member] | General Partner [Member] | Pinedale GP [Member]                      
Debt Instrument [Line Items]                      
Controlling economic interest                   81.05%  
Value of economic interest   $ 47,400,000