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Note 8 - Income Taxes - Reconciliation of the Income Tax Benefit to the Statutory Federal Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Expected federal income tax benefit at 21%	$ (6,537)	$ (6,602)
Increase (decrease) in valuation allowance	4,942	4,433
State income tax	11	11
Expiring carryforwards	716	933
Non-deductible expenses and other	879	1,236
Income tax expense	$ 11	$ 11

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to expiring carryforwards.

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