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Note 10 - Product Warranty Obligations - Deferred Product Obligations (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Current portion - other accrued liabilities $ 25,559 $ 25,396    
Long-term portion - other long-term liabilities 18,003 16,389    
Total 43,562 41,785 $ 36,319 $ 35,422
Current portion - other accrued liabilities 13,930 13,646    
Long-term portion - other long-term liabilities 56,914 54,694    
Total $ 70,844 $ 68,340 $ 60,113 $ 57,854