Property, Plant and Equipment (Detail Textuals) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ 16,409,000	$ 15,600,000
Depreciation and amortization expense	823,000	718,000
Advanced Technology Group
Property, Plant and Equipment [Line Items]
Construction in progress	77,000	57,000
Buildings
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ 3,472,000	$ 3,258,000