Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Segment	Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | Segment	2
Revenues from Operations
Revenues from operations	$ 5,945	$ 5,624
Operating Income from Operations
Consolidated operating income	158	108
Interest income (expense), net	12	(6)
Other income, net	24	12
Total other income	36	6
Income Before Income Taxes	194	114
Unallocated corporate expense [Member]
Operating Income from Operations
Consolidated operating income	(394)	(254)
Electronic components [Member]
Revenues from Operations
Revenues from operations	5,731	5,392
Electronic components [Member] | Reportable Segment [Member]
Operating Income from Operations
Consolidated operating income	550	326
Electronic instruments [Member]
Revenues from Operations
Revenues from operations	214	232
Electronic instruments [Member] | Reportable Segment [Member]
Operating Income from Operations
Consolidated operating income	$ 2	$ 36