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Note 7 - Agreements and Commitments - Changes in Warranty Obligations (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Balance $ 898,072 $ 962,313
Warranty costs charged to cost of goods sold 22,579 86,256
Utilization charges against reserve (239,052) (93,653)
Foreign currency effect 13,343 (56,844)
Balance $ 694,943 $ 898,072