Note 13 - Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Balance	$ 8,230	$ 7,210
Additions to current period tax positions	1,499	1,020
Balance	$ 9,729	$ 8,230