Net Intangible Assets (Schedule of Finite Lived Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,748	$ 1,598
Accumulated Amortization	1,259	1,033
Net Carrying Amount	489	565
Amortization expense	$ 226	$ 235
Non-compete [Member]
Finite-Lived Intangible Assets [Line Items]
Average Useful Life	5 years	5 years
Gross Carrying Amount	$ 120	$ 120
Accumulated Amortization	120	118
Net Carrying Amount	$ 0	$ 2
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	1,126	915
Net Carrying Amount	$ 352	$ 563
Communication Technolog [Member]
Finite-Lived Intangible Assets [Line Items]
Average Useful Life	3 years
Gross Carrying Amount	$ 150
Accumulated Amortization	13
Net Carrying Amount	$ 137