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Note 5 - Goodwill and Acquisition-Related Intangible Assets, Net (Details) (Cost Of Revenue [Member], USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cost Of Revenue [Member]
   
Note 5 - Goodwill and Acquisition-Related Intangible Assets, Net (Details) [Line Items]    
Amortization of Intangible Assets $ 400,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_IncomeStatementLocationAxis
= mpwr_CostOfRevenueMember
$ 0us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_IncomeStatementLocationAxis
= mpwr_CostOfRevenueMember