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Note 11 - Related Party Transactions (Details Textual) - China JV Partner [Member] - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Accounts Payable $ 489,000   $ 489,000   $ 243,000
Purchase From Supplier [Member]          
Related Party Transaction, Purchases from Related Party $ 341,000 $ 42,000 $ 370,000 $ 93,000