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Note 5 - Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Cost Basis $ 25,248 $ 25,248
Accumulated Amortization (13,653) (13,470)
Accumulated Impairment Charges (7,592) (7,592)
Intangible assets, net $ 4,003 $ 4,186
Remaining Average Amortization Period (Year) 4 years 146 days 4 years 219 days
Noncompete Agreements [Member]    
Cost Basis $ 170 $ 170
Accumulated Amortization (118) (111)
Accumulated Impairment Charges
Intangible assets, net $ 52 $ 59
Remaining Average Amortization Period (Year) 1 year 292 days 2 years 36 days
Customer Relationships [Member]    
Cost Basis $ 15,979 $ 15,979
Accumulated Amortization (7,055) (6,979)
Accumulated Impairment Charges (7,592) (7,592)
Intangible assets, net $ 1,332 $ 1,408
Remaining Average Amortization Period (Year) 4 years 255 days 4 years 328 days
Trade Names [Member]    
Cost Basis $ 9,099 $ 9,099
Accumulated Amortization (6,480) (6,380)
Accumulated Impairment Charges
Intangible assets, net $ 2,619 $ 2,719
Remaining Average Amortization Period (Year) 6 years 182 days 6 years 292 days