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BANK LINE OF CREDIT (Details) (USD $)
Mar. 31, 2015
Jul. 05, 2012
Line of Credit Facility [Line Items]    
Number of banks used for Credit Agreement   2powi_NumberOfBanksUsedForCreditAgreement
Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Credit Agreement, maximum borrowing capacity   $ 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
Letters of credit outstanding 0us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
 
Credit agreement outstanding 0us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
 
Line of credit sublimit for issuance of letters of credit [Member]    
Line of Credit Facility [Line Items]    
Credit Agreement, maximum borrowing capacity   $ 20,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= powi_LineOfCreditSublimitForIssuanceOfLettersOfCreditMember