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Note 12 - Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Tax at federal statutory rate	$ (1,669)	$ (2,430)
State, net of federal benefit	(364)	(342)
Research and development credit	(162)	(267)
Share-based compensation	176	178
Net operating loss expiration	(233)	(130)
Other	1	3
Change in valuation allowance	1,785	2,728
Total provision for income taxes	$ 0	$ 0

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