Annual report [Section 13 and 15(d), not S-K Item 405]

Note 9 - Income Taxes (Details Textual)

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Note 9 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Income Tax Expense (Benefit) $ 0 $ 0
Deferred Tax Assets, Valuation Allowance 34,981 35,672
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 0 $ 0
Research Tax Credit Carryforward [Member]    
Tax Credit Carryforward, Amount 3,000  
Domestic Tax Jurisdiction [Member]    
Operating Loss Carryforwards 89,400  
Domestic Tax Jurisdiction [Member] | Indefinite Carryforward [Member]    
Operating Loss Carryforwards 74,900  
Domestic Tax Jurisdiction [Member] | Expires 2034 [Member]    
Operating Loss Carryforwards 14,500  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards 141,000  
State and Local Jurisdiction [Member] | Indefinite Carryforward [Member]    
Operating Loss Carryforwards 0  
State and Local Jurisdiction [Member] | Expires 2034 [Member]    
Operating Loss Carryforwards $ 141,000