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Note 4 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Current Income Tax Expense (Benefit) | $ 0 | $ 0
Operating Loss Carryforwards | 45,900,000 | 44,000,000
Operating Loss Carryforwards, Will Be Carried Forward Indefinitely | $ 42.9 |
Operating Loss Carryforwards, Will Be Carried Forward Indefinitely, Available to Offset Taxable Income, Percentage | 80.00% |
Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards | $ 1,400,000 | $ 1,400,000

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- Definition Percentage available to Offset Taxable Income related to amount of operating loss carryforward that will be carried forward Indefinitely, before tax effects, available to reduce future taxable income under enacted tax laws. + References No definition available. + Details
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