Foreign Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Frequency Control Devices - Significant Foreign Revenues:
Revenues from Operations	$ 20,713	$ 23,013
Portion of foreign sales	10.00%
China [Member]
Frequency Control Devices - Significant Foreign Revenues:
Revenues from Operations	$ 778	2,604
Malaysia [Member]
Frequency Control Devices - Significant Foreign Revenues:
Revenues from Operations	2,455	3,018
All other foreign countries [Member]
Frequency Control Devices - Significant Foreign Revenues:
Revenues from Operations	2,220	3,835
Foreign [Member]
Frequency Control Devices - Significant Foreign Revenues:
Revenues from Operations	$ 5,453	$ 9,457