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Note 10 - Product Warranty Obligations - Deferred Product Obligations (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Current portion - other accrued liabilities $ 26,948   $ 25,396      
Long-term portion - other long-term liabilities 18,376   16,389      
Total 45,324 $ 43,562 41,785 $ 38,660 $ 36,319 $ 35,422
Current portion - other accrued liabilities 13,925   13,646      
Long-term portion - other long-term liabilities 60,592   54,694      
Total $ 74,517 $ 70,844 $ 68,340 $ 63,007 $ 60,113 $ 57,854