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Note 6 - Product Warranties - Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Balance at beginning of year $ 1,098 $ 1,435
Provision 378 606
Claims (415) (530)
Balance at end of period $ 1,061 $ 1,511