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Note 8 - Deferred Product Obligations (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Current portion - other accrued liabilities $ 21,071   $ 21,726      
Long-term portion - other long-term liabilities 9,664   8,471      
Total 30,735 $ 31,904 30,197 $ 28,185 $ 29,277 $ 30,909
Current portion - other accrued liabilities 5,034   6,026      
Long-term portion - other long-term liabilities 24,048   22,935      
Total $ 29,082 $ 28,830 $ 28,961 $ 27,241 $ 27,531 $ 27,193