Note 15 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Unrecognized tax benefit, beginning of period	$ 7,613	$ 6,720
Increase in unrecognized tax benefit for positions taken in prior period	272	332
Increase in unrecognized tax benefit for positions taken in current period	990	750
Statute of limitation expirations	(228)	(189)
Settlements	0	0
Unrecognized tax benefit, end of period	$ 8,647	$ 7,613