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Note 6 - Product Warranties - Product Warranties (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Balance at beginning of year $ 1,380 $ 1,098
Provision 1,350 803
Claims (1,254) (904)
Balance at end of period $ 1,476 $ 997