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Note 16 - Segment and Geographic Information (Details) - Revenue By Product Family (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenue from External Customer [Line Items]      
Product family $ 282,535,000us-gaap_Revenues $ 238,091,000us-gaap_Revenues $ 213,813,000us-gaap_Revenues
DC To DC Products [Member]      
Revenue from External Customer [Line Items]      
Product family 253,083,000us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= mpwr_DCToDCProductsMember		 211,337,000us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= mpwr_DCToDCProductsMember		 188,736,000us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= mpwr_DCToDCProductsMember
Lighting Control Products [Member]      
Revenue from External Customer [Line Items]      
Product family $ 29,452,000us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= mpwr_LightingControlProductsMember		 $ 26,754,000us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= mpwr_LightingControlProductsMember		 $ 25,077,000us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= mpwr_LightingControlProductsMember