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Note 11 - Related Party Transactions (Details Textual) - China JV Partner [Member] - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Accounts Payable $ 30,000   $ 30,000   $ 82,000
Purchase From Supplier [Member]          
Related Party Transaction, Purchases from Related Party $ 189,000 $ 50,000 $ 282,000 $ 501,000