Note L - Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Note L - Commitments and Contingencies (Details) [Line Items]
Operating Leases, Future Minimum Payments Due	$ 39,154,000
Operating Leases, Rent Expense	5,200,000	4,700,000	4,200,000
Non-Cancelable [Member]
Note L - Commitments and Contingencies (Details) [Line Items]
Operating Leases, Future Minimum Payments Due	7,200,000
Reasonably Assured [Member]
Note L - Commitments and Contingencies (Details) [Line Items]
Operating Leases, Future Minimum Payments Due	$ 32,000,000
Minimum [Member]
Note L - Commitments and Contingencies (Details) [Line Items]
Lessee Leasing Arrangements, Operating Leases, Term of Contract	3 years
Maximum [Member]
Note L - Commitments and Contingencies (Details) [Line Items]
Lessee Leasing Arrangements, Operating Leases, Term of Contract	5 years