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Note 8 - Agreements and Commitments - Changes in Warranty Obligations (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Balance | $ 962,313 | $ 1,056,613
Warranty costs charged to cost of goods sold | 52,990 | 177,302
Utilization charges against reserve | (77,720) | (191,068)
Release of accrual related to expired warranties | 0 | 0
Foreign currency effect | (132,653) | (80,534)
Balance | $ 804,930 | $ 962,313

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