Note 4 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Indefinite-lived intangible assets	$ 1,400	$ 1,400
Intangible Assets, Gross (Excluding Goodwill), Total	13,522	13,522
Accumulated amortization	(10,457)	(10,269)
Intangible assets, net	3,065	3,253
Trademarks [Member]
Intangible assets	3,459	3,459
Customer Relationships [Member]
Intangible assets	$ 8,663	$ 8,663