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Earnings Per Share	3 Months Ended
	Jul. 31, 2016
Earnings Per Share [Abstract]
Earnings Per Share	B. Earnings Per Share Basic earnings per share is based on the weighted average number of common shares outstanding during the three month period. 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 110,000 shares were not included in the computation of diluted earnings per share for the three month period ended July 31, 2016, because the option exercise prices were greater than the average market price of the common shares during the quarter, and accordingly, such options would have an antidilutive effect. Options to purchase 29,276 shares were not included in the computation of diluted earnings per share for the three month period ended July 31, 2015, because the effect would be anti-dilutive.

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- References

No definition available.

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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 3
-URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256

Reference 2: 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 3: 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=64863997&loc=d3e1252-109256

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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