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Note 6 - Income Taxes (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Research and Experimentation, Capitalized Costs $ 2,000,000 $ 5,500,000 $ 7,800,000
Research & experimental expenditures 1,472,000 3,925,000  
Unrecognized Tax Benefits 2,214,000 2,176,000 $ 1,943,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 136,000 68,000  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 1,900,000 1,900,000  
Share Repurchase Program, Excise Tax $ 195,000 $ 331,000  
Domestic Tax Jurisdiction [Member]      
Open Tax Year 2021 2022 2023 2024 2025    
State and Local Jurisdiction [Member]      
Open Tax Year 2018 2019 2020 2021 2022 2023 2024 2025    
Foreign Tax Jurisdiction [Member] | Canada Revenue Agency [Member]      
Open Tax Year 2020 2021 2022 2023 2024 2025    
Domestic Research [Member]      
Tax Amortization Period (Year) 5 years    
Foreign Research [Member]      
Tax Amortization Period (Year) 15 years