Note 9 - Income Tax Expense (Benefit) - Unrecognized Tax Benefits (Details) - Excluding Interest and Penalties [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance at the beginning of year	$ 807	$ 801
Additions for tax positions of prior years	105	129
Reductions due to lapse of statute of limitations	(116)	(123)
Balance at the end of year	$ 796	$ 807