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Earnings Per Share	6 Months Ended
	Oct. 31, 2011
Earnings Per Share [Abstract]
Earnings Per Share	F. Earnings Per Share Basic earnings per share is based on the weighted average number of common shares outstanding during the three and six month periods. Diluted earnings per share reflects the assumed exercise and conversion of outstanding options under the Company's stock option plans, except when options have an anti-dilutive effect. Options to purchase shares of 325,300 were not included in diluted earnings per share for the three and six month periods ended October 31, 2011, because the effect would be anti-dilutive.

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- Definition

The entire disclosure for earnings per share.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

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-Section 55

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-URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 40

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

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