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Note 8 - Deferred Product Obligations (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Current portion - other accrued liabilities $ 23,433 $ 21,726    
Long-term portion - other long-term liabilities 8,471 8,471    
Total 31,904 30,197 $ 29,277 $ 30,909
Current portion - other accrued liabilities 5,189 6,026    
Long-term portion - other long-term liabilities 23,641 22,935    
Total $ 28,830 $ 28,961 $ 27,531 $ 27,193