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Bank Borrowing Arrangements (Details) (Revolving Credit Facility [Member], USD $)
1 Months Ended
Nov. 30, 2007
Mar. 29, 2015
Jun. 15, 2014
Line of Credit Facility [Line Items]      
Borrowing capacity on revolving credit facility $ 10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity   $ 12,500,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Description of variable rate basis LIBOR    
Amount outstanding   $ 0us-gaap_LineOfCredit  
LIBOR [Member]
     
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember