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Note I - Stock-based Compensation (Details Textual)	1 Months Ended		3 Months Ended	6 Months Ended
	Aug. 31, 2015 shares	May 31, 2015 shares	Jul. 31, 2016	Oct. 31, 2016 USD ($) $ / shares shares	Oct. 31, 2015 USD ($) shares	Aug. 05, 2015 shares	Oct. 14, 2009 shares
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares				10,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares				168,527
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares				18,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares				$ 45.09
Employee Stock Option [Member] | Restated Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			10 years
Employee Stock Option [Member]
Allocated Share-based Compensation Expense				$ 723,000	$ 887,000
Allocated Share-based Compensation Expense, Net of Tax				$ 453,000	$ 556,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares				35,000	298,750
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value				$ 338,000	$ 5,200,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				$ 3,200,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				3 years 109 days
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		5 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares	40,000	95,125
Employee Service Share-based Compensation, Not Currently Expected to Vest Awards, Compensation Cost Not yet Recognized				$ 1,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Not Currently Expected to Vest, Outstanding, Number | shares				64,750
Restated Option Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance | shares						1,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares				276,500
Stock Incentive Plan [Member]
Allocated Share-based Compensation Expense				$ 47,000	50,000
Allocated Share-based Compensation Expense, Net of Tax				29,000	31,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				$ 688,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				4 years 73 days
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares							350,000
Allocated Share-based Compensation Expense				$ 783,000	949,000
Allocated Share-based Compensation Expense, Net of Tax				$ 491,000	595,000
Number of Stock Option Plans				2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value				$ 15,900,000	$ 11,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number | shares				876,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value				$ 15,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term				3 years 91 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price | $ / shares				$ 23.98

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Unrecognized cost of not currently expected to vest share-based compensation awards.

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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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Aggregate number of common shares reserved for future issuance.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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Gross 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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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