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Note 5 - Product Warranties - Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Balance at beginning of year $ 1,435 $ 1,380
Provision 606 269
Claims (530) (402)
Balance at end of period $ 1,511 $ 1,247