Note 11 - Income Taxes - Summarizes the Changes in the Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Valuation allowances, beginning of year	$ 15,456	$ 12,421
Net operating loss and other temporary differences	1,997	2,926
Expiration of net operating losses and limitations	(90)	0
Adjustment to deferred taxes	(197)	67
Impact of state tax rate change	22	42
Other	(5)	0
Valuation allowance, end of year	$ 17,183	$ 15,456