Acquired Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Assets eligible for amortization:
Gross Carrying Amount		$ 23,205	$ 18,222
Accumulated Amortization		(4,662)	(4,099)
Unamortized intangible assets:
Goodwill, Gross Carrying Amount	[1]	14,489	12,796
Goodwill, Accumulated Amortization	[1]	(227)	(227)
Customer Lists [Member]
Assets eligible for amortization:
Gross Carrying Amount		4,778	4,288
Accumulated Amortization		(3,463)	(3,071)
Patents [Member]
Assets eligible for amortization:
Gross Carrying Amount		72	72
Accumulated Amortization		(20)	(16)
Noncompete Agreements [Member]
Assets eligible for amortization:
Gross Carrying Amount		332	332
Accumulated Amortization		(332)	(326)
Software [Member]
Assets eligible for amortization:
Gross Carrying Amount		2,844	234
Accumulated Amortization		(358)	(234)
Trade Names [Member]
Assets eligible for amortization:
Gross Carrying Amount		190
Accumulated Amortization		(3)
Other Intangible Assets [Member]
Assets eligible for amortization:
Gross Carrying Amount		500	500
Accumulated Amortization		$ (259)	$ (225)

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