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Note 5 - Goodwill and Acquisition-Related Intangible Assets, Net (Details) - Future Amortization Expense (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Future Amortization Expense [Abstract]  
2015 (remaining nine months) $ 1,100us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2016 1,467us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 1,467us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 and thereafter 366us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Total $ 4,400us-gaap_FiniteLivedIntangibleAssetsNet