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Intangible Assets (Schedule of Company's Intangible Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Unamortized intangible assets:    
Goodwill, Gross Carrying Amount [1] $ 14,489 $ 14,489
Goodwill, Accumulated Amortization [1] (227) (227)
Total intangible assets 23,205 23,205
Accumulated Amortization (5,735) (5,520)
Customer Lists [Member]    
Assets eligible for amortization:    
Gross Carrying Amount 4,778 4,778
Accumulated Amortization (4,012) (3,902)
Patents [Member]    
Assets eligible for amortization:    
Gross Carrying Amount 72 72
Accumulated Amortization (25) (24)
Non-compete Agreements [Member]    
Assets eligible for amortization:    
Gross Carrying Amount 332 332
Accumulated Amortization (332) (332)
Software [Member]    
Assets eligible for amortization:    
Gross Carrying Amount 2,844 2,844
Accumulated Amortization (824) (731)
Trade Name [Member]    
Assets eligible for amortization:    
Gross Carrying Amount 190 190
Accumulated Amortization (15) (13)
Other [Member]    
Assets eligible for amortization:    
Gross Carrying Amount 500 500
Accumulated Amortization $ (300) $ (291)
[1] Amortization through December 31, 2001 prior to adoption of FASB ASC 350.