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Note F - Debt Facilities (Details) - Revolving Credit Facilities (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Sep. 30, 2012
Mar. 09, 2012
Debt Instrument [Line Items]        
Revolving credit facilities $ 102,685us-gaap_LineOfCredit $ 97,032us-gaap_LineOfCredit    
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Revolving credit facilities 2.375%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
     
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Revolving credit facilities 145,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
  145,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
125,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Revolving credit facilities Oct. 08, 2017      
Revolving credit facilities $ 102,685us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
$ 97,032us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember