Note 12 - Commitments and Contingencies - Redeemable Non-controlling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Balance	$ 10,036	$ 9,970	$ 7,494	$ 16,112
Net income (loss) attributable to noncontrolling interest	1,039	(156)	(17)	(956)
Acquired businesses' noncontrolling interest	(941)	0	2,657	0
Fair value adjustment of put option	0	(1,874)	0	(7,216)
Balance	$ 10,134	$ 7,940	$ 10,134	$ 7,940