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Related Party Transactions (Narrative) (Details) - USD ($)
3 Months Ended
Dec. 18, 2007
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Related Party Transaction [Line Items]        
Methane gas revenue   $ 0 $ 0  
Working interest percent 15.00%      
Bond, face value   0    
Related party allowance for doubtful accounts receivable   14,000   $ 14,000
Accounts receivable - related parties balance    
Methane Project [Member]        
Related Party Transaction [Line Items]        
Percent of net profits, interest   7.50%    
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    
Hoactzin Partners, L.P. [Member] | Methane Project [Member]        
Related Party Transaction [Line Items]        
Methane gas revenue   0    
Net profits   0    
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    
Accounts receivable - related parties balance       $ 0