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Note 6 - Goodwill and Acuisition-Related Intangible Assets, Net (Details) (Cost Of Revenue [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Cost Of Revenue [Member]
 
Note 6 - Goodwill and Acuisition-Related Intangible Assets, Net (Details) [Line Items]  
Amortization of Intangible Assets $ 0.7us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_IncomeStatementLocationAxis
= mpwr_CostOfRevenueMember