Note 10 - Commitments and Contingencies - Redeemable Non-controlling Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance	$ 7,494	$ 16,112	$ 6,502
Net income (loss) attributable to noncontrolling interest	38	(1,403)	2,395
Acquired businesses' noncontrolling interest	2,892	0	0
Fair value adjustment of put option	202	(7,215)	7,215
Balance	$ 10,626	$ 7,494	$ 16,112