Note 7 - Long-lived Assets - Cost Basis, Accumulated Amortization and Net Book Value of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Intangible assets, cost basis	$ 25,248	$ 25,248
Intangible assets, accumulated amortization	(13,470)	(12,737)
Intangible assets, net	$ 4,186	$ 4,919
Intangible assets, remaining weighted average amortization period (Year)	4 years 219 days	6 years 182 days
Intangible assets, accumulated impairment charges	$ (7,592)	$ (7,592)
Noncompete Agreements [Member]
Intangible assets, cost basis	170	170
Intangible assets, accumulated amortization	(111)	(83)
Intangible assets, net	$ 59	$ 87
Intangible assets, remaining weighted average amortization period (Year)	2 years 36 days	3 years 36 days
Customer Relationships [Member]
Intangible assets, cost basis	$ 15,979	$ 15,979
Intangible assets, accumulated amortization	(6,979)	(6,674)
Intangible assets, net	$ 1,408	$ 1,713
Intangible assets, remaining weighted average amortization period (Year)	4 years 328 days	5 years 292 days
Intangible assets, accumulated impairment charges	$ (7,592)	$ (7,592)
Trade Names [Member]
Intangible assets, cost basis	9,099	9,099
Intangible assets, accumulated amortization	(6,380)	(5,980)
Intangible assets, net	$ 2,719	$ 3,119
Intangible assets, remaining weighted average amortization period (Year)	6 years 292 days	7 years 292 days