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Equity Method Investment (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Equity Method Investment (Textual)        
Ownership interest percentage in crawford county gas gathering company, LLC 50.00%   50.00%  
Equity investment income (loss) in crawford county gas gathering company, LLC $ (6,000) $ (2,000) $ (6,000) $ (1,000)
Cash received $ 275,000   $ 275,000