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Liquidity (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 26, 2018
Jan. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mar. 23, 2018
Mar. 21, 2018
Liquidity [Line Items]                              
Net loss from operations     $ 132,000 $ (315,000) $ (178,000) $ (213,000) $ (260,000) $ (908,000) $ (1,627,000) $ (1,404,000) $ (574,000) $ (4,199,000) $ (24,721,000)    
Sale of facility                     7,000 $ 44,000      
Prosperity Bank [Member]                              
Liquidity [Line Items]                              
Credit facility current borrowing capacity     $ 1,250,000               $ 1,250,000        
Subsequent Event [Member]                              
Liquidity [Line Items]                              
Sale of facility $ 2,650,000 $ 2,650,000                          
Subsequent Event [Member] | Prosperity Bank [Member]                              
Liquidity [Line Items]                              
Credit facility current borrowing capacity                             $ 2,000,000
Current funds drawn                           $ 0