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Note 9 - Agreements and Commitments - Changes in Warranty Obligations (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Balance $ 621,031 $ 629,100
Warranty costs charged to cost of goods sold 66,193 100,726
Utilization charges against reserve 0 (72,736)
Foreign currency effect 80,831 (36,059)
Balance $ 768,055 $ 621,031