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Note 8 - Product Warranty Obligations - Deferred Product Obligations (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Current portion - other accrued liabilities $ 21,159   $ 21,726      
Long-term portion - other long-term liabilities 10,200   8,471      
Total 31,359 $ 30,735 30,197 $ 28,862 $ 28,185 $ 30,909
Current portion - other accrued liabilities 6,131   6,026      
Long-term portion - other long-term liabilities 24,364   22,935      
Total $ 30,495 $ 29,082 $ 28,961 $ 28,088 $ 27,241 $ 27,193