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Note 5 - Product Warranties - Product Warranties (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Balance at beginning of year $ 1,435 $ 1,380
Provision 1,058 1,572
Claims (1,360) (1,418)
Balance at end of period $ 1,133 $ 1,534