Annual report pursuant to Section 13 and 15(d)

Financing Notes Receivable - Black Bison Financing Notes (Details)

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Financing Notes Receivable - Black Bison Financing Notes (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 12, 2018
Jun. 16, 2016
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Feb. 29, 2016
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Provision for loan (gain) loss     $ (536,867) $ 0 $ 0 $ 500,000 $ (36,867) $ 0 $ 5,014,466      
Proceeds from asset foreclosure and sale $ 237,000           $ 17,999 $ 0 223,451      
Black Bison Water Services LLC | Long-term Debt                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Maximum borrowing capacity                       $ 12,000,000
Subsidiaries | Black Bison Water Services LLC | Long-term Debt                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Maximum borrowing capacity                       $ 3,300,000
Loans Agreement | Subsidiaries                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Provision for loan (gain) loss                   $ 13,800,000    
Outstanding loan balance                     $ 2,000,000  
BB Intermediate                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Provision for loan (gain) loss                 $ 832,000      
Equity interest percentage                     100.00%  
Wells and Related Equipment and Facilities | Expedition Water Solutions                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Proceeds from asset foreclosure and sale   $ 748,000                    
Fair value of future royalty payments   $ 450,000