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Note L - Commitments and Contingencies (Details) (USD $)
 12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Note L - Commitments and Contingencies (Details) [Line Items]      
Operating Leases, Future Minimum Payments Due $ 38,688,000    
Operating Leases, Rent Expense 4,700,000 4,200,000 3,700,000
Non-Cancelable [Member]
      
Note L - Commitments and Contingencies (Details) [Line Items]      
Operating Leases, Future Minimum Payments Due 7,400,000    
Reasonably Assured [Member]
      
Note L - Commitments and Contingencies (Details) [Line Items]      
Operating Leases, Future Minimum Payments Due $ 31,300,000    
Minimum [Member]
      
Note L - Commitments and Contingencies (Details) [Line Items]      
Operating Lease Term 3 years    
Maximum [Member]
      
Note L - Commitments and Contingencies (Details) [Line Items]      
Operating Lease Term 5 years