Note 7 - Income Taxes - Change in Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Unrecognized Tax Benefits, Beginning Balance	$ 1,557	$ 1,075
Reductions due to lapse of applicable statute of limitations	(92)	(76)
Additions based on tax positions related to the current year	478	558
Unrecognized Tax Benefits, Ending Balance	$ 1,943	$ 1,557