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Liquidity (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 26, 2018
Jan. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Liquidity [Line Items]              
Net loss from operations     $ 109,000 $ (178,000) $ 1,352,000 $ (391,000) $ (574,000)
Sale of methane facility assets $ 2,650,000 $ 2,650,000          
Prosperity Bank [Member]              
Liquidity [Line Items]              
Credit facility current borrowing capacity     2,000,000   2,000,000    
Current funds drawn     $ 0   $ 0