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Note 9 - Product Warranty Obligations - Deferred Product Obligations (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Current portion - other accrued liabilities $ 20,556 $ 20,576    
Long-term portion - other long-term liabilities 15,763 14,846    
Total 36,319 35,422 $ 32,008 $ 31,695
Current portion - other accrued liabilities 11,998 11,017    
Long-term portion - other long-term liabilities 48,115 46,837    
Total $ 60,113 $ 57,854 $ 37,562 $ 36,139