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Sales, Contract Assets and Contract Liabilities (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Mar. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Contract Revenue Cost       $ 280,000    
Costs in Excess of Billings, Current $ 126,000     126,000   $ 0
Revenues, Total 0   $ 260,000 360,000 $ 260,000  
Billings in Excess of Cost, Current $ 0     0   $ 115,000
California oil producer [Member]            
Contract Value     $ 900,000 $ 540,000    
Revenues, Total   $ 360,000