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Note 4 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022
Current Income Tax Expense (Benefit), Total | $ 0 |
Operating Loss Carryforwards | $ 39,900 | $ 44,000
Operating Loss Carryforwards, Will Be Carried Forward Indefinitely |  | $ 41,100
Operating Loss Carryforwards, Will Be Carried Forward Indefinitely, Available to Offset Taxable Income, Percentage | 80.00% |

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