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Note 13 - Litigation (Details) (USD $)
3 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Jan. 31, 2014
Nov. 30, 2013
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2012
May 03, 2012
Dec. 31, 2011
Aug. 31, 2012
Attorney Fees [Member] | O2 Micro [Member]                        
Note 13 - Litigation (Details) [Line Items]                        
Gain Contingency, Unrecorded Amount                   $ 9,100,000us-gaap_GainContingencyUnrecordedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_O2MicroMember
/ us-gaap_NatureOfExpenseAxis
= mpwr_AttorneyFeesMember
   
Attorney Fees [Member] | Linear Technology Corporation [Member]                        
Note 13 - Litigation (Details) [Line Items]                        
Proceeds from Legal Settlements 200,000us-gaap_ProceedsFromLegalSettlements
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_LinearTechnologyCorporationMember
/ us-gaap_NatureOfExpenseAxis
= mpwr_AttorneyFeesMember
                     
Taxable Costs [Member] | O2 Micro [Member]                        
Note 13 - Litigation (Details) [Line Items]                        
Gain Contingency, Unrecorded Amount                   300,000us-gaap_GainContingencyUnrecordedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_O2MicroMember
/ us-gaap_NatureOfExpenseAxis
= mpwr_TaxableCostsMember
   
O2 Micro [Member]                        
Note 13 - Litigation (Details) [Line Items]                        
Proceeds from Legal Settlements   9,500,000us-gaap_ProceedsFromLegalSettlements
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_O2MicroMember
9,500,000us-gaap_ProceedsFromLegalSettlements
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_O2MicroMember
9,500,000us-gaap_ProceedsFromLegalSettlements
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_O2MicroMember
9,500,000us-gaap_ProceedsFromLegalSettlements
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_O2MicroMember
             
Litigation Settlement, Expense       500,000us-gaap_LitigationSettlementExpense
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_O2MicroMember
               
Silergy [Member]                        
Note 13 - Litigation (Details) [Line Items]                        
Proceeds from Legal Settlements 300,000us-gaap_ProceedsFromLegalSettlements
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_SilergyMember
        300,000us-gaap_ProceedsFromLegalSettlements
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_SilergyMember
300,000us-gaap_ProceedsFromLegalSettlements
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_SilergyMember
300,000us-gaap_ProceedsFromLegalSettlements
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_SilergyMember
1,200,000us-gaap_ProceedsFromLegalSettlements
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_SilergyMember
     
Legal Settlements, Receivables                     2,000,000mpwr_LegalSettlementsReceivables
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_SilergyMember
 
Outstanding Legal Settlement         0mpwr_OutstandingLegalSettlement
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_SilergyMember
             
Linear Technology Corporation [Member]                        
Note 13 - Litigation (Details) [Line Items]                        
Gain Contingency, Unrecorded Amount                       2,300,000us-gaap_GainContingencyUnrecordedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_LinearTechnologyCorporationMember
Proceeds from Legal Settlements $ 2,300,000us-gaap_ProceedsFromLegalSettlements
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mpwr_LinearTechnologyCorporationMember