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Note 6 - Product Warranties - Product Warranties (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Balance at beginning of year $ 1,361 $ 1,438
Provision 886 528
Claims (857) (628)
Balance at end of period $ 1,390 $ 1,338