Annual report pursuant to Section 13 and 15(d)

Note 8 - Income Taxes (Details Textual)

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Note 8 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 11,900  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 0 $ 0
Domestic Tax Authority [Member]    
Operating Loss Carryforwards 43,400  
Domestic Tax Authority [Member] | Research and Development Tax [Member    
Tax Credit Carryforward, Amount $ 500 300
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]    
Open Tax Year 2019 2020 2021 2022 2023  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards $ 46,700  
State and Local Jurisdiction [Member] | Research and Development Tax [Member    
Tax Credit Carryforward, Amount 100 $ 100
Foreign Tax Authority [Member] | Corporate Income Tax [Member]    
Operating Loss Carryforwards 187,600  
Foreign Tax Authority [Member] | Trade Tax [Member]    
Operating Loss Carryforwards $ 183,700