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Note 8- Litigation (Details) (O2 Micro [Member], USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Mar. 31, 2014
Jan. 31, 2014
Nov. 30, 2013
Dec. 31, 2013
May 03, 2012
Note 8- Litigation (Details) [Line Items]          
Proceeds from Legal Settlements $ 9.5us-gaap_ProceedsFromLegalSettlements $ 9.5us-gaap_ProceedsFromLegalSettlements $ 9.5us-gaap_ProceedsFromLegalSettlements $ 9.5us-gaap_ProceedsFromLegalSettlements  
Litigation Settlement, Expense 0.5us-gaap_LitigationSettlementExpense        
Attorney Fees [Member]
          
Note 8- Litigation (Details) [Line Items]          
Gain Contingency, Unrecorded Amount         9.1us-gaap_GainContingencyUnrecordedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_O2MicroMember
/ us-gaap_NatureOfExpenseAxis
= mpwr_AttorneyFeesMember
Taxable Costs [Member]
          
Note 8- Litigation (Details) [Line Items]          
Gain Contingency, Unrecorded Amount         $ 0.3us-gaap_GainContingencyUnrecordedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_O2MicroMember
/ us-gaap_NatureOfExpenseAxis
= mpwr_TaxableCostsMember