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Description Of Business And Significant Accounting Policies (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Description Of Business And Significant Accounting Policies [Line Items]      
Material natural gas imbalances $ 0 $ 0  
Methane gas revenue 0 0  
Impairment of equipment and materials inventory   88,000  
Unevaluated properties $ 0 106,000  
Current cost discount 10.00%    
Stock based compensation $ 14,000 17,000 $ 12,000
Federal net operating loss carryforwards 30,200,000    
Deferred tax asset $ 242,000  
Shares excluded from dilutive shares   114 760
Customer A [Member] | Revenue [Member]      
Description Of Business And Significant Accounting Policies [Line Items]      
Customer's percentage of revenue 75.30% 73.90% 74.50%
Customer B [Member] | Revenue [Member]      
Description Of Business And Significant Accounting Policies [Line Items]      
Customer's percentage of revenue 13.10% 13.10% 16.10%
Customer C [Member] | Revenue [Member]      
Description Of Business And Significant Accounting Policies [Line Items]      
Customer's percentage of revenue 11.00% 12.00% 8.60%
Two Customers [Member] | Accounts Receivable [Member]      
Description Of Business And Significant Accounting Policies [Line Items]      
Customer's percentage of revenue 76.20% 84.10%  
Customer D [Member] | Accounts Receivable [Member]      
Description Of Business And Significant Accounting Policies [Line Items]      
Customer's percentage of revenue 63.20% 71.00%  
Minimum [Member]      
Description Of Business And Significant Accounting Policies [Line Items]      
Federal net operating loss carryforwards expiration between, years Dec. 31, 2019    
Maximum [Member]      
Description Of Business And Significant Accounting Policies [Line Items]      
Federal net operating loss carryforwards expiration between, years Dec. 31, 2036