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Note 7 - Segment and Geographic Information (Details) - Revenue by Product Family (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenue from External Customer [Line Items]    
Product family $ 73,538us-gaap_Revenues $ 60,061us-gaap_Revenues
DC To DC Products [Member]    
Revenue from External Customer [Line Items]    
Product family 66,297us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= mpwr_DCToDCProductsMember		 53,935us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= mpwr_DCToDCProductsMember
Lighting Control Products [Member]    
Revenue from External Customer [Line Items]    
Product family $ 7,241us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= mpwr_LightingControlProductsMember		 $ 6,126us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= mpwr_LightingControlProductsMember