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Note L - Commitments and Contingencies (Details Textual) - USD ($)	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Letters of Credit Outstanding, Amount	$ 250,000
Operating Leases, Future Minimum Payments Due, Total	48,073,000
Operating Leases, Rent Expense, Total	6,700,000	$ 6,200,000	$ 6,200,000
Non-cancelable [Member]
Operating Leases, Future Minimum Payments Due, Total	1,500,000
Reasonably Assured [Member]
Operating Leases, Future Minimum Payments Due, Total	46,600,000
Owned or Controlled by One Preferred Shareholder [Member]
Operating Leases, Future Minimum Payments Due, Total	$ 13,200,000
Minimum [Member]
Lessee, Operating Lease, Term of Contract	3 years
Maximum [Member]
Lessee, Operating Lease, Term of Contract	5 years

X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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Balance Type:	na
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X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697

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X

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X

- Details

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X

- Details

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X

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