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Note 7 - Agreements and Commitments - Changes in Warranty Obligations (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Balance $ 629,100 $ 898,072
Warranty costs charged to cost of goods sold 47,455 115,401
Utilization charges against reserve 0 (408,234)
Foreign currency effect (13,955) 23,861
Balance $ 662,600 $ 629,100