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Note H - Weighted Average Shares Outstanding (Details) - Weighted Average Shares of Common Stock Outstanding	3 Months Ended		9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Weighted Average Shares of Common Stock Outstanding [Abstract]
Weighted average shares outstanding-basic	8,587,761us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,917,826us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,636,036us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,984,958us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive options and restricted stock	448,325us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	452,809us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	431,159us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	464,422us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average shares outstanding-diluted	9,036,086us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,370,635us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,067,195us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,449,380us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Antidilutive securities not included:
Options	74,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	80,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	77,667us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	73,333us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

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- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

-URI http://asc.fasb.org/extlink&oid=6508534

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256

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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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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