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Note K - Stock-based Compensation Plans - Stock Incentive Plan (Details) - Stock Incentive Plan [Member] - $ / shares	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Unvested shares (in shares)	184,828	180,500	179,000
Unvested shares, weighted average grant date fair value (in dollars per share)	$ 49.71	$ 46.16	$ 45.96
Shares granted (in shares)	7,690	12,328	3,000
Shares granted, weighted average grant date fair value (in dollars per share)	$ 98.43	$ 102.03	$ 53.30
Shares vested (in shares)	0	(7,000)	0
Shares cancelled (in shares)	(500)	(1,000)	(1,500)
Shares cancelled, weighted average grant date fair value (in dollars per share)	$ 35.00	$ 37.07	$ 36.38
Shares vested, weighted average grant date fair value (in dollars per share)		$ 52.10
Unvested shares (in shares)	192,018	184,828	180,500
Unvested shares, weighted average grant date fair value (in dollars per share)	$ 51.70	$ 49.71	$ 46.16

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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X

- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Topic 718
-SubTopic 10
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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Topic 718
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-Paragraph 2
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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X

- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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