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Related Party Transactions (Narrative) (Details) - USD ($)
Dec. 18, 2007
Sep. 30, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]      
Working interest percent 15.00%    
Related party allowance for doubtful accounts receivable   $ 14,000 $ 14,000
Accounts receivable - related parties balance  
Hoactzin Partners, L.P. [Member]      
Related Party Transaction [Line Items]      
Related parties accounts payable   159,000 159,000
Past due related parties accounts payable   159,000  
Related Party [Member]      
Related Party Transaction [Line Items]      
Related party allowance for doubtful accounts receivable   159,000 159,000
Related Party [Member] | Hoactzin Partners, L.P. [Member]      
Related Party Transaction [Line Items]      
Accounts receivable-related party, allowance for doubtful accounts   159,000 159,000
Accounts receivable - related parties balance   $ 159,000 $ 0