Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Segment	Jun. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | Segment			2
Revenues from Operations
Revenues from operations	$ 6,157	$ 5,859	$ 12,102	$ 11,483
Operating Income
Total operating income	489	44	647	152
Interest income (expense), net	(6)	(5)	6	(11)
Other income, net	67	6	91	18
Total other income	61	1	97	7
Income Before Income Taxes	550	45	744	159
Unallocated corporate expense [Member]
Operating Income
Total operating income	(172)	(448)	(566)	(702)
Product [Member] | Electronic components [Member]
Revenues from Operations
Revenues from operations	5,834	5,626	11,565	11,018
Product [Member] | Electronic components [Member] | Reportable Segment [Member]
Operating Income
Total operating income	621	481	1,171	807
Product [Member] | Electronic instruments [Member]
Revenues from Operations
Revenues from operations	323	233	537	465
Product [Member] | Electronic instruments [Member] | Reportable Segment [Member]
Operating Income
Total operating income	$ 40	$ 11	$ 42	$ 47