Note 12 - Commitments and Contingencies - Redeemable Non-controlling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Balance	$ 10,473	$ 16,476	$ 7,494	$ 16,112
Net loss attributable to noncontrolling interest	(437)	(265)	(1,056)	(801)
Acquired businesses' noncontrolling interest	0	0	3,598	0
Fair value adjustment of put option	0	(6,241)	0	(5,341)
Balance	$ 10,036	$ 9,970	$ 10,036	$ 9,970