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, 2021	Dec. 31, 2020
Intangible assets, cost basis	$ 25,248	$ 25,248
Intangible assets, accumulated amortization	(14,203)	(13,470)
Intangible assets, net	$ 3,453	$ 4,186
Intangible assets, remaining weighted average amortization period (Year)	5 years 2 months 12 days	6 years 1 month 6 days
Intangible assets, accumulated impairment charges	$ (7,592)	$ (7,592)
Noncompete Agreements [Member]
Intangible assets, cost basis	170	170
Intangible assets, accumulated amortization	(139)	(111)
Intangible assets, net	$ 31	$ 59
Intangible assets, remaining weighted average amortization period (Year)	1 year 1 month 6 days	2 years 1 month 6 days
Customer Relationships [Member]
Intangible assets, cost basis	$ 15,979	$ 15,979
Intangible assets, accumulated amortization	(7,284)	(6,979)
Intangible assets, net	$ 1,103	$ 1,408
Intangible assets, remaining weighted average amortization period (Year)	4 years	4 years 10 months 24 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	(6,780)	(6,380)
Intangible assets, net	$ 2,319	$ 2,719
Intangible assets, remaining weighted average amortization period (Year)	5 years 9 months 18 days	6 years 9 months 18 days