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Note 11 - Related Party Transactions (Details Textual) - China JV Partner [Member] - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Accounts Payable $ 482,000   $ 482,000   $ 243,000
Purchase From Supplier [Member]          
Related Party Transaction, Purchases from Related Party $ 588,000 $ 189,000 $ 958,000 $ 282,000