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Note 2 - Stock-Based Compensation (Details) - RSU Summary (USD $)
3 Months Ended
Mar. 31, 2015
Note 2 - Stock-Based Compensation (Details) - RSU Summary [Line Items]  
Shares 4,048,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Weighted-Average Grant Date Fair Value Per Share $ 26.14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Granted (1) 876,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod [1]
Granted (1) $ 48.63us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue [1]
Performance adjustment (2) (192,000)mpwr_ShareBasedCompensationPerformanceAwardsAdjustment [2]
Performance adjustment (2) $ 45.97mpwr_PerformanceAwardsAdjustmentWeightedAverageGrantDateFairValue [2]
Released (520,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Released $ 23.83us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Forfeited (26,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Forfeited $ 25.42us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
Shares 4,186,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Weighted-Average Grant Date Fair Value Per Share $ 29.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Time-Based RSUs [Member]  
Note 2 - Stock-Based Compensation (Details) - RSU Summary [Line Items]  
Shares 589,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSMember
Weighted-Average Grant Date Fair Value Per Share $ 28.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSMember
Granted (1) 217,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSMember
[1]
Granted (1) $ 48.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSMember
[1]
Performance adjustment (2)    [2]
Performance adjustment (2)    [2]
Released (117,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSMember
Released $ 22.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSMember
Forfeited (9,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSMember
Forfeited $ 29.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSMember
Shares 680,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSMember
Weighted-Average Grant Date Fair Value Per Share $ 35.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSMember
PSUs [Member]  
Note 2 - Stock-Based Compensation (Details) - RSU Summary [Line Items]  
Shares 1,659,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= mpwr_PSUSMember
Weighted-Average Grant Date Fair Value Per Share $ 28.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= mpwr_PSUSMember
Granted (1) 659,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= mpwr_PSUSMember
[1]
Granted (1) $ 48.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= mpwr_PSUSMember
[1]
Performance adjustment (2) (192,000)mpwr_ShareBasedCompensationPerformanceAwardsAdjustment
/ us-gaap_AwardTypeAxis
= mpwr_PSUSMember
[2]
Performance adjustment (2) $ 45.97mpwr_PerformanceAwardsAdjustmentWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= mpwr_PSUSMember
[2]
Released (403,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= mpwr_PSUSMember
Released $ 24.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= mpwr_PSUSMember
Forfeited (17,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= mpwr_PSUSMember
Forfeited $ 23.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= mpwr_PSUSMember
Shares 1,706,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= mpwr_PSUSMember
Weighted-Average Grant Date Fair Value Per Share $ 34.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= mpwr_PSUSMember
MSUs [Member]  
Note 2 - Stock-Based Compensation (Details) - RSU Summary [Line Items]  
Shares 1,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= mpwr_MSUSMember
Weighted-Average Grant Date Fair Value Per Share $ 23.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= mpwr_MSUSMember
Granted (1)    [1]
Granted (1)    [1]
Performance adjustment (2)    [2]
Performance adjustment (2)    [2]
Shares 1,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= mpwr_MSUSMember
Weighted-Average Grant Date Fair Value Per Share $ 23.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= mpwr_MSUSMember
[1] Amount reflects the maximum number of PSUs that can be earned assuming the achievement of the highest level of performance conditions.
[2] Amount reflects the number of PSUs that have not been earned or may not be earned based on management's probability assessment.