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Note 6 - Product Warranties - Product Warranties (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Balance at beginning of year $ 1,438 $ 1,380
Provision 528 948
Claims (628) (822)
Balance at end of period $ 1,338 $ 1,506