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Note 5 - Disclosure of Compensation Related Costs, Share Based Payments (Details) - Stock Option Activity (USD $)	3 Months Ended
	Jul. 31, 2014	Apr. 30, 2014
Note 5 - Disclosure of Compensation Related Costs, Share Based Payments (Details) - Stock Option Activity [Line Items]
Outstanding- Number of option shares	645,124
Employee Stock Option [Member]
Note 5 - Disclosure of Compensation Related Costs, Share Based Payments (Details) - Stock Option Activity [Line Items]
Outstanding- Number of option shares	645,124	712,024
Outstanding- Weighted average option exercise price	$ 36.36	$ 36.73
Exercised	(66,900)
Exercised	$ 40.27

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Number of options outstanding, including both vested and non-vested options.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Name Accounting Standards Codification

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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