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Note 6 - Product Warranties - Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Balance at beginning of year $ 1,438 $ 1,380
Provision 294 479
Claims (302) (355)
Balance at end of period $ 1,430 $ 1,504