Annual report pursuant to Section 13 and 15(d)

Note 9 - Income Taxes (Details Textual)

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Note 9 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Tax Expense (Benefit) $ 0 $ 0
Deferred Tax Assets, Valuation Allowance 35,672 30,972
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 0 $ 0
Research Tax Credit Carryforward [Member]    
Tax Credit Carryforward, Amount 2,900  
Domestic Tax Authority [Member]    
Operating Loss Carryforwards 83,900  
Domestic Tax Authority [Member] | Indefinite Carryforward [Member]    
Operating Loss Carryforwards 69,400  
Domestic Tax Authority [Member] | Expires 2034 [Member]    
Operating Loss Carryforwards 14,500  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards 147,400  
State and Local Jurisdiction [Member] | Indefinite Carryforward [Member]    
Operating Loss Carryforwards 600  
State and Local Jurisdiction [Member] | Expires 2034 [Member]    
Operating Loss Carryforwards $ 146,900