Intangible Assets (Schedule of Company's Intangible Assets) (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Unamortized intangible assets:
Goodwill, Gross Carrying Amount	[1]	$ 16,121	$ 12,796
Goodwill, Accumulated Amortization	[1]	(227)	(227)
Total intangible assets		23,522	18,222
Accumulated Amortization		(4,458)	(4,099)
Customer Lists [Member]
Assets eligible for amortization:
Gross Carrying Amount		4,613	4,288
Accumulated Amortization		(3,352)	(3,071)
Patents [Member]
Assets eligible for amortization:
Gross Carrying Amount		72	72
Accumulated Amortization		(19)	(16)
Non-compete Agreements [Member]
Assets eligible for amortization:
Gross Carrying Amount		482	332
Accumulated Amortization		(334)	(326)
Software [Member]
Assets eligible for amortization:
Gross Carrying Amount		1,734	234
Accumulated Amortization		(276)	(234)
Other [Member]
Assets eligible for amortization:
Gross Carrying Amount		500	500
Accumulated Amortization		$ (250)	$ (225)

[1] Amortization through December 31, 2001 prior to adoption of FASB ASC 350.