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Note 9 - Agreements and Commitments - Changes in Warranty Obligations (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Balance $ 629,100 $ 898,072
Warranty costs charged to cost of goods sold 85,835 115,401
Utilization charges against reserve (13,946) (408,234)
Foreign currency effect (20,727) 23,861
Balance $ 680,262 $ 629,100