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Note 5 - Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Cost Basis $ 25,248 $ 25,248
Accumulated Amortization (14,020) (13,470)
Accumulated Impairment Charges (7,592) (7,592)
Intangible assets, net $ 3,636 $ 4,186
Remaining Average Amortization Period (Year) 4 years 4 years 7 months 6 days
Noncompete Agreements [Member]    
Cost Basis $ 170 $ 170
Accumulated Amortization (132) (111)
Accumulated Impairment Charges 0 0
Intangible assets, net $ 38 $ 59
Remaining Average Amortization Period (Year) 1 year 3 months 18 days 2 years 1 month 6 days
Customer Relationships [Member]    
Cost Basis $ 15,979 $ 15,979
Accumulated Amortization (7,208) (6,979)
Accumulated Impairment Charges (7,592) (7,592)
Intangible assets, net $ 1,179 $ 1,408
Remaining Average Amortization Period (Year) 4 years 2 months 12 days 4 years 10 months 24 days
Trade Names [Member]    
Cost Basis $ 9,099 $ 9,099
Accumulated Amortization (6,680) (6,380)
Accumulated Impairment Charges 0 0
Intangible assets, net $ 2,419 $ 2,719
Remaining Average Amortization Period (Year) 6 years 6 years 9 months 18 days