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Note 6 - Disclosure of Compensation Related Costs, Share Based Payments (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			3 Months Ended		3 Months Ended	0 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014 Stock Incentive Plan [Member]	Jul. 31, 2014 Employee Stock Option [Member]	Apr. 30, 2014 Employee Stock Option [Member]	Jul. 31, 2014 Restricted Stock Units (RSUs) [Member]	Jun. 06, 2014 Restricted Stock Units (RSUs) [Member] Certain Officer and Key Employee [Member]	Jun. 19, 2013 Restricted Stock Units (RSUs) [Member] Certain Officer and Key Employee [Member]	Jun. 06, 2014 Restricted Stock Units (RSUs) [Member] Non Employee Member of the Board [Member]	Sep. 13, 2013 Restricted Stock Units (RSUs) [Member] Non Employee Member of the Board [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			3,916,668
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period						91,000	91,000	77,650		14,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value									$ 6,584
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	645,124			645,124	712,024
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	19,231
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 292 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	645,124
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 36.36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	5 years 292 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	19,231
Allocated Share-based Compensation Expense	1,632	1,044
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	2,018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value				6,270
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				$ 0		$ 9,312

X

- Definition

This item represents the fair value of equity instruments that were granted but not vested during the period.

+ References

No definition available.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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Unrecognized cost of unvested share-based compensation awards.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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X

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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