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Note 9 - Income Taxes - Reconciliation of the Income Tax Benefit to the Statutory Federal Income Tax Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Expected federal income tax benefit at 21% $ (6,602) $ (5,205)
Increase (decrease) in valuation allowance 4,433 3,906
State income tax 11 7
Expiring carryforwards 933 577
Non-deductible expenses and other 1,236 722
Income tax expense $ 11 $ 7