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Earnings Per Share	9 Months Ended
	Jan. 31, 2012
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 nine 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 308,800 were not included in the computation of diluted earnings per share for the three and nine month periods ended January 31, 2012, because the effect would be anti-dilutive as a result of the reported net losses. Options to purchase shares of 119,600 were not included in the computation of diluted earnings per share for the three and nine month periods ended January 31, 2011, because the option exercise prices were greater than the average market price of the common shares at that date, and accordingly, such options would have an antidilutive effect.

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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1278-109256



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Section S99

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