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Note 2 - Stock-Based Compensation (Details) (USD $)
3 Months Ended 12 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Feb. 28, 2015
Nov. 13, 2014
Note 2 - Stock-Based Compensation (Details) [Line Items]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) 876,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod [1]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 2,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 6,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue      
Proceeds from Stock Options Exercised 1,292,000us-gaap_ProceedsFromStockOptionsExercised 5,554,000us-gaap_ProceedsFromStockOptionsExercised      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options 100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions        
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares) 30,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 43,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans      
Proceeds from Stock Plans 1,121,000us-gaap_ProceedsFromStockPlans 1,053,000us-gaap_ProceedsFromStockPlans      
Time-Based RSUs [Member] | Minimum [Member]          
Note 2 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year        
Time-Based RSUs [Member] | Maximum [Member]          
Note 2 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years        
Time-Based RSUs [Member]          
Note 2 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) 217,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSMember
[1]        
PSUs [Member] | Executive Officer [Member]          
Note 2 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)       172,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= mpwr_PSUSMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
 
PSUs [Member] | Non-Executive Employees [Member]          
Note 2 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)       58,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= mpwr_PSUSMember
/ us-gaap_TitleOfIndividualAxis
= mpwr_NonExecutiveEmployeesMember
 
PSUs [Member]          
Note 2 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) 659,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= mpwr_PSUSMember
[1]        
MSUs [Member]          
Note 2 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 10 years        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)    [1]        
Time-Based RSUs PSUs MSUs [Member]          
Note 2 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested 25,600,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSPSUSMSUSMember
10,200,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSPSUSMSUSMember
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding 220,400,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSPSUSMSUSMember
       
Share Price (in Dollars per share) $ 52.65us-gaap_SharePrice
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSPSUSMSUSMember
       
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 95,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= mpwr_TimeBasedRSUSPSUSMSUSMember
       
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 5 years        
2015 Executive PSUs [Member] | Executive Officer [Member]          
Note 2 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       2 years  
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed       300.00%mpwr_ShareBasedCompensationShareBasedPaymentOtherThanOptionsPercentageAllowed
/ us-gaap_AwardTypeAxis
= mpwr_Executive2015PSUSMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
 
2015 Non-Executive PSUs [Member] | Minimum [Member]          
Note 2 - Stock-Based Compensation (Details) [Line Items]          
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed       200.00%mpwr_ShareBasedCompensationShareBasedPaymentOtherThanOptionsPercentageAllowed
/ us-gaap_AwardTypeAxis
= mpwr_Non-Executive2015PSUSMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
2015 Non-Executive PSUs [Member] | Maximum [Member]          
Note 2 - Stock-Based Compensation (Details) [Line Items]          
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed       300.00%mpwr_ShareBasedCompensationShareBasedPaymentOtherThanOptionsPercentageAllowed
/ us-gaap_AwardTypeAxis
= mpwr_Non-Executive2015PSUSMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
2015 Non-Executive PSUs [Member]          
Note 2 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       2 years  
2014 Plan [Member]          
Note 2 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)         5,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= mpwr_Plan2014Member
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 5,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= mpwr_Plan2014Member
       
Employee Stock Purchase Plan [Member]          
Note 2 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 4,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= mpwr_EmployeeStockPurchasePlanMember
       
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= mpwr_EmployeeStockPurchasePlanMember
       
Stock Issued During Period Shares Employee Stock Purchase Plans Intrinsic Value 400,000mpwr_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlansIntrinsicValue
/ us-gaap_PlanNameAxis
= mpwr_EmployeeStockPurchasePlanMember
500,000mpwr_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlansIntrinsicValue
/ us-gaap_PlanNameAxis
= mpwr_EmployeeStockPurchasePlanMember
     
Proceeds from Stock Plans $ 1,100,000us-gaap_ProceedsFromStockPlans
/ us-gaap_PlanNameAxis
= mpwr_EmployeeStockPurchasePlanMember
$ 1,100,000us-gaap_ProceedsFromStockPlans
/ us-gaap_PlanNameAxis
= mpwr_EmployeeStockPurchasePlanMember
     
[1] Amount reflects the maximum number of PSUs that can be earned assuming the achievement of the highest level of performance conditions.