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Note 6 - China Joint Venture (Details Textual) - USD ($)
3 Months Ended 22 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Jun. 01, 2023
Dec. 31, 2019
Corporate Joint Venture [Member]          
Joint Venture, Required Capital Contribution       $ 408,000 $ 357,000
Joint Venture, Increase from Capital Contributions $ 31,000 $ 0 $ 184,000    
China JV Partner [Member]          
Ownership Interest, Percent         51.00%