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Note 11 - Agreements and Commitments - Changes in Warranty Obligations (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Balance $ 898,072 $ 962,313
Warranty costs charged to cost of goods sold 115,401 86,256
Utilization charges against reserve (408,234) (93,653)
Foreign currency effect 23,861 (56,844)
Balance $ 629,100 $ 898,072