Foreign Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Significant Foreign Revenues:
Revenues from operations	$ 20,891	$ 20,713
Malaysia [Member]
Significant Foreign Revenues:
Revenues from operations	3,240	2,455
China [Member]
Significant Foreign Revenues:
Revenues from operations	315	778
All other foreign countries [Member]
Significant Foreign Revenues:
Revenues from operations	2,443	2,220
Foreign [Member]
Significant Foreign Revenues:
Revenues from operations	$ 5,998	5,453
Portion of foreign sales	10.00%
Domestic [Member]
Significant Foreign Revenues:
Revenues from operations	$ 14,893	$ 15,260