Business Segments (Detail Textuals)	6 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($) Segment	Dec. 31, 2017 USD ($) Segment
Segment Reporting Information [Line Items]
Total identifiable assets	$ 39,614,000	$ 37,986,000
Number of operating segments | Segment	2	2
Operating Segments | Advanced Technology Group ("ATG")
Segment Reporting Information [Line Items]
Total identifiable assets	$ 28,666,000	$ 26,331,000
Operating Segments | CPG
Segment Reporting Information [Line Items]
Total identifiable assets	$ 10,948,000	$ 11,655,000