Note 11 - Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Pre-tax income (loss)	$ (8,539)	$ (6,641)
Income tax benefit at federal statutory rate	(1,796)	(1,646)
State tax benefit, net of federal tax effect	(189)	(421)
Effect of change in state tax rate	404	(22)
Change in valuation allowance	3,308	1,727
Expirations of net operating losses and application of IRC 382 limitation	33	90
Fair value adjustments and others	(1,960)	5
Other nondeductible expenses	53	89
Adjustments to deferreds	159	197
Income tax expense	$ 12	$ 19