Note 9 - Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Unrecognized tax benefits at the beginning of year	$ 612	$ 768	$ 820
Additions/adjustments for tax positions of current year	0	0	0
Additions/adjustments for tax positions of prior years	(25)	(57)	(52)
Reductions for settlements with taxing authorities	0	0	0
Reductions for lapses of the applicable statutes of limitations	0	(99)	0
Unrecognized tax benefits at the end of the year	$ 587	$ 612	$ 768