Note 11 - Income Taxes - Summarizes the Changes in the Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Valuation allowances, beginning of year	$ 17,183	$ 15,456
Net operating loss and other temporary differences	3,974	1,997
Expiration of net operating losses and limitations	(33)	(90)
Adjustment to deferred taxes	(159)	(197)
Impact of state tax rate change	(404)	22
Other	70	(5)
Valuation allowance, end of year	$ 20,491	$ 17,183