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Note 8 - Agreements and Commitments - Changes in Warranty Obligations (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Balance $ 962,313 $ 1,056,613
Warranty costs charged to cost of goods sold 53,684 177,302
Utilization charges against reserve 0 (191,068)
Release of accrual related to expired warranties 0 0
Foreign currency effect (83,405) (80,534)
Balance $ 932,592 $ 962,313