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Liquidity (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 26, 2018
Jan. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Liquidity [Line Items]          
Net loss from operations     $ 1,243,000 $ (213,000) $ (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    
Current funds drawn     $ 0