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Note 6 - Product Warranties - Product Warranties (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Balance at beginning of year $ 1,098 $ 1,435
Provision 586 815
Claims (686) (1,012)
Balance at end of period $ 998 $ 1,238