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Note 7 - Agreements and Commitments - Changes in Warranty Obligations (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Balance $ 898,072 $ 962,313
Warranty costs charged to cost of goods sold 53,274 86,256
Utilization charges against reserve (277,651) (93,653)
Foreign currency effect 14,254 (56,844)
Balance $ 687,949 $ 898,072