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Liquidity (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 26, 2018
Jan. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Aug. 24, 2018
Mar. 21, 2018
Liquidity [Line Items]                  
Net loss from operations     $ 298,000 $ (315,000) $ 1,650,000 $ (706,000) $ (574,000)    
Credit facility current borrowing capacity     3,000,000   3,000,000     $ 3,000,000  
Credit facility maximum borrowing capacity     2,740,000   2,740,000     $ 2,740,000  
Sale of methane facility assets $ 2,650,000 $ 2,650,000              
Prosperity Bank [Member]                  
Liquidity [Line Items]                  
Credit facility current borrowing capacity     3,000,000   3,000,000        
Current funds drawn     0   0        
Credit facility maximum borrowing capacity     $ 50,000,000   $ 50,000,000       $ 2,000,000