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Note 5 - Disclosure of Compensation Related Costs, Share Based Payments (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		0 Months Ended			3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	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]	Sep. 13, 2013 Restricted Stock Units (RSUs) [Member] Non Employee Members Of The Board [Member]	Jul. 31, 2014 Restricted Stock Units (RSUs) [Member]	Jul. 31, 2014 Employee Stock Option [Member]	Apr. 30, 2014 Employee Stock Option [Member]	Jul. 31, 2014 Restricted Stock Units (RSUs) [Member]	Jul. 31, 2014 2009 Stock Incentive Plan [Member]
Note 5 - Disclosure of Compensation Related Costs, Share Based Payments (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)										3,916,668
Share-based Compensation Arrangement by Share-based Payment Award, Description	Each share issued pursuant to a stock option will reduce the shares available for grant by one, and each share issued pursuant to an award of restricted stock or restricted stock units will reduce the shares available for grant by two.
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)				77,650		91,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures (in Shares)			91,000		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 (in Shares)	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 (in Shares)	645,124
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in Dollars per share)	$ 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
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
Allocated Share-based Compensation Expense	1,632	1,044
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized							$ 0		$ 9,312

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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.

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Unrecognized cost of unvested share-based compensation awards.

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General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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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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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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Net number of share options (or share units) granted during the period.

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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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