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Note 9 - Income Taxes (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2024
USD ($)
Tax Credit Carryforward, Amount $ 5,500
Income Taxes Paid 0
Domestic Tax Jurisdiction [Member]  
Operating Loss Carryforwards 116,800
Operating Loss Carryforwards, Subject to Expiration $ 28,300