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Note F - Summary of Revolving Credit Facilities (Details) - USD ($)
9 Months Ended 12 Months Ended
Jun. 24, 2013
Jan. 31, 2016
Apr. 30, 2016
Feb. 18, 2016
Feb. 17, 2016
Apr. 30, 2015
Sep. 30, 2012
Mar. 09, 2012
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate   2.375% 2.375%          
Revolving Credit Facility [Member]                
Line of Credit Facility, Maximum Borrowing Capacity     $ 172,500,000 $ 172,500,000 $ 145,000,000   $ 145,000,000 $ 125,000,000
Line of Credit Facility, Expiration Date Jun. 24, 2016   Oct. 08, 2017          
Balance at     $ 107,386,000     $ 102,221,000    
Interest rate     2.81%     2.56%    
Balance at     $ 107,902,000     $ 102,221,000