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Note 5 - Product Warranties - Product Warranties (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Balance at beginning of year $ 1,435 $ 1,380
Provision 815 1,160
Claims (1,012) (884)
Balance at end of period $ 1,238 $ 1,656