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Note 6 - China Joint Venture (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 25 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 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 $ 30,000 $ 0 $ 61,000 $ 0 $ 214,000    
China JV Partner [Member]              
Ownership Interest, Percent             51.00%