Note 11 - Income Taxes - Reconciliation of Unrecognized Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Unrecognized tax benefits at beginning of year	$ 5,140	$ 2,491	$ 1,470
Increases related to current year tax positions	2,055	2,649	1,021
Increases related to prior year tax positions	1,730	0	0
Unrecognized tax benefits at beginning of year	$ 8,925	$ 5,140	$ 2,491