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Note F - Debt Facilities (Details) - Revolving Credit Facilities (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jul. 31, 2014
Apr. 30, 2014
Mar. 09, 2012
Debt Instrument [Line Items]      
Revolving credit facilities $ 94,220 $ 97,032  
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
     
Debt Instrument [Line Items]      
Revolving credit facilities 2.25%    
Revolving Credit Facility [Member]
     
Debt Instrument [Line Items]      
Revolving credit facilities 145,000   125,000
Revolving credit facilities Jun. 24, 2016    
Revolving credit facilities $ 94,220 $ 97,032