Annual report pursuant to Section 13 and 15(d)

Note 17 - Income Taxes (Details Textual)

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Note 17 - Income Taxes (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 4.8  
Capitalized Research and Development Expenditures 3.6 $ 3.6
Unrecognized Tax Benefits 0.5  
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]    
Operating Loss Carryforwards 171.4  
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration 146.2  
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 25.2  
Tax Credit Carryforward, Amount 0.5  
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]    
Operating Loss Carryforwards 4.1  
Tax Credit Carryforward, Amount $ 0.5