Note 9 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance, beginning of year	$ 637	$ 458
Additions for tax positions of prior years	(31)
Additions for tax positions of prior years		37
Additions based on tax positions related to the current year	72	142
Balance, end of year	$ 678	$ 637