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Property, Plant and Equipment (Detail Textuals) - USD ($)
3 Months Ended 6 Months Ended
Mar. 09, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]            
Sell unused commercial real property in Franklinville, New York $ 180,000          
Depreciation and amortization expense   $ 218,000 $ 205,000 $ 428,000 $ 412,000  
Advanced Technology Group ("ATG")            
Property, Plant and Equipment [Line Items]            
Construction in progress   $ 335,000   $ 335,000   $ 77,000