Property, Plant and Equipment (Detail Textuals) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Sell unused commercial real property in Franklinville, New York	$ 180,000
Accumulated depreciation	17,188,000	$ 16,409,000
Depreciation and amortization expense	885,000	823,000
Advanced Technology Group
Property, Plant and Equipment [Line Items]
Construction in progress	665,000	77,000
Buildings
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ 3,598,000	$ 3,472,000