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Note 11 - Income Taxes - Schedule of Statutory Federal Income Tax Applied to Loss Before Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Statutory federal income tax rate of 21 percent applied to loss before income taxes	$ (3,032)	$ (2,583)
State taxes - net of federal benefit	(660)	(810)
Meals and entertainment	1	3
Warrants	0	(12)
Stock-based compensation	371	522
Other non-deductible expenses	16	(89)
Expiration of tax attributes	184	484
Change in tax rate	(346)	207
Others	(49)	0
Valuation allowance	3,515	2,278
Income tax expense	$ 0	$ 0

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