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Note 6 - Product Warranties - Product Warranties (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Balance at beginning of year $ 1,438 $ 1,380
Provision 925 1,350
Claims (965) (1,254)
Balance at end of period $ 1,398 $ 1,476