Net Intangible Assets (Schedule of Finite Lived Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,628	$ 1,748
Accumulated Amortization	1,400	1,259
Net Carrying Amount	228	489
Amortization expense	$ 261	$ 226
Non-compete [Member]
Finite-Lived Intangible Assets [Line Items]
Average Useful Life		5 years
Gross Carrying Amount		$ 120
Accumulated Amortization		120
Net Carrying Amount		$ 0
Unpatented Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Average Useful Life	7 years	7 years
Gross Carrying Amount	$ 1,478	$ 1,478
Accumulated Amortization	1,337	1,126
Net Carrying Amount	$ 141	$ 352
Communication Technolog [Member]
Finite-Lived Intangible Assets [Line Items]
Average Useful Life	3 years	3 years
Gross Carrying Amount	$ 150	$ 150
Accumulated Amortization	63	13
Net Carrying Amount	$ 87	$ 137