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Note 6 - China Joint Venture (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 01, 2023
Dec. 31, 2019
Corporate Joint Venture [Member]            
Joint Venture, Required Capital Contribution         $ 255,000 $ 357,000
Joint Venture, Increase from Capital Contributions $ 0 $ 153,000 $ 0 $ 153,000    
China JV Partner [Member]            
Ownership Interest, Percent           51.00%