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

Note 9 - Income Taxes (Details Textual)

v3.26.1
Note 9 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Deferred Tax Assets, Valuation Allowance $ 34,600 $ 34,981
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 0 0
Income Tax Expense (Benefit) 2 $ 0
Research Tax Credit Carryforward [Member]    
Tax Credit Carryforward, Amount 3,000  
Domestic Tax Jurisdiction [Member]    
Operating Loss Carryforwards 88,700  
Domestic Tax Jurisdiction [Member] | Indefinite Carryforward [Member]    
Operating Loss Carryforwards 74,300  
Domestic Tax Jurisdiction [Member] | Expires 2035 [Member]    
Operating Loss Carryforwards 14,500  
Domestic Tax Jurisdiction [Member] | Expires 2037 [Member]    
Operating Loss Carryforwards 141,100  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards 144,300  
State and Local Jurisdiction [Member] | Indefinite Carryforward [Member]    
Operating Loss Carryforwards $ 3,200