Net Intangible Assets (Schedule of Finite Lived Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,598	$ 1,598
Accumulated Amortization	798	563
Intangible assets, net	800	1,035
Amortization Expense	$ 235	$ 235
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Average Useful Life	5 years	5 years
Gross Carrying Amount	$ 120	$ 120
Accumulated Amortization	94	70
Intangible assets, net	$ 26	$ 50
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	704	493
Intangible assets, net	$ 774	$ 985