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Note 16 - Segment and Geographic Information (Details) - Long Lived Assets By Geographic Region (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Note 16 - Segment and Geographic Information (Details) - Long Lived Assets By Geographic Region [Line Items]    
Long lived assets by region $ 84,782us-gaap_AssetsNoncurrent $ 66,481us-gaap_AssetsNoncurrent
CHINA    
Note 16 - Segment and Geographic Information (Details) - Long Lived Assets By Geographic Region [Line Items]    
Long lived assets by region 37,147us-gaap_AssetsNoncurrent
/ us-gaap_StatementGeographicalAxis
= country_CN		 41,557us-gaap_AssetsNoncurrent
/ us-gaap_StatementGeographicalAxis
= country_CN
UNITED STATES    
Note 16 - Segment and Geographic Information (Details) - Long Lived Assets By Geographic Region [Line Items]    
Long lived assets by region 33,913us-gaap_AssetsNoncurrent
/ us-gaap_StatementGeographicalAxis
= country_US		 24,719us-gaap_AssetsNoncurrent
/ us-gaap_StatementGeographicalAxis
= country_US
BERMUDA    
Note 16 - Segment and Geographic Information (Details) - Long Lived Assets By Geographic Region [Line Items]    
Long lived assets by region 13,383us-gaap_AssetsNoncurrent
/ us-gaap_StatementGeographicalAxis
= country_BM		  
Other Region [Member]    
Note 16 - Segment and Geographic Information (Details) - Long Lived Assets By Geographic Region [Line Items]    
Long lived assets by region $ 339us-gaap_AssetsNoncurrent
/ us-gaap_StatementGeographicalAxis
= mpwr_OtherRegionMember		 $ 205us-gaap_AssetsNoncurrent
/ us-gaap_StatementGeographicalAxis
= mpwr_OtherRegionMember