Revenue Recognition (Schedule of Disaggregated Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues from contract with customer	$ 6,731	$ 6,112
Military [Member]
Disaggregation of Revenue [Line Items]
Revenues from contract with customer	4,799	4,447
Commercial, including Industrial and Medical [Member]
Disaggregation of Revenue [Line Items]
Revenues from contract with customer	313	336
Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenues from contract with customer	688	422
Multiple [Member]
Disaggregation of Revenue [Line Items]
Revenues from contract with customer	931	907
North and South America [Member]
Disaggregation of Revenue [Line Items]
Revenues from contract with customer	3,540	3,398
Europe, Middle East, and Africa [Member]
Disaggregation of Revenue [Line Items]
Revenues from contract with customer	2,701	2,327
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenues from contract with customer	$ 490	$ 387