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Note 12 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Income Tax Expense (Benefit) $ 0 $ 0
Deferred Tax Liabilities, Net, Total 0 0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 1,800 2,700
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 1,300 $ 1,200
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member]    
Operating Loss Carryforwards 119,400  
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member] | Research Tax Credit Carryforward [Member]    
Tax Credit Carryforward, Amount 4,100  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards 65,300  
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]    
Tax Credit Carryforward, Amount $ 3,000