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Note H - Weighted Average Shares Outstanding - Weighted Average Shares of Common Stock Outstanding (Details) - shares	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Weighted average shares outstanding-basic (in shares)	6,924,035	7,548,846
Dilutive options and restricted stock (in shares)	202,650	219,464
Weighted average shares outstanding-diluted (in shares)	7,126,685	7,768,310
Employee Stock Option [Member]
Antidilutive securities not included:
Antidilutive securities (in shares)	120,000	337,750
Restricted Stock [Member]
Antidilutive securities not included:
Antidilutive securities (in shares)		34,000

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- References

No definition available.

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- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

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-Publisher FASB
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-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 260
-SubTopic 10
-Section 45
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