Note 12 - Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Balance at beginning of year	$ 2,366	$ 2,307
Increase based on the tax positions in the current year	203	228
Increase (Decrease) for tax positions of prior year	12
Increase (Decrease) for tax positions of prior year		(169)
Balance at end of year	$ 2,581	$ 2,366