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Note I - Stock Based Compensation (Details Textual)	1 Months Ended		6 Months Ended		12 Months Ended
	Aug. 31, 2015 shares	May. 31, 2015 shares	Oct. 31, 2015 USD ($) $ / shares shares	Oct. 31, 2014 USD ($) shares	Apr. 30, 2015 shares	Aug. 05, 2015 shares	Oct. 14, 2009 shares	Oct. 13, 2009 shares
The 1997 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares			0
Restated Option Plan [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			10 years
Restated Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares			322,250
Common Stock, Additional Capital Shares Reserved for Future Issuance | shares						300,000
Common Stock, Capital Shares Reserved for Future Issuance | shares						1,800,000
Stock Incentive Plan [Member]
Allocated Share-based Compensation Expense			$ 50,000	$ 45,000
Allocated Share-based Compensation Expense, Net of Tax			31,000	28,200
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			$ 445,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			4 years 182 days
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares							350,000	150,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares			177,527
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares			0		0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares			9,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares			$ 52.10
Employee Stock Option [Member]
Allocated Share-based Compensation Expense			$ 887,000	353,000
Allocated Share-based Compensation Expense, Net of Tax			$ 556,000	$ 221,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares			298,750	44,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value			$ 5,200,000	$ 595,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			$ 4,100,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			4 years 51 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	104,250
Employee Service Share-based Compensation, Not Currently Expected to Vest Awards, Compensation Cost Not yet Recognized			$ 1,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Not Currently Expected to Vest, Outstanding, Number | shares			68,750
Allocated Share-based Compensation Expense			$ 949,000	412,000
Allocated Share-based Compensation Expense, Net of Tax			$ 595,000	258,000
Number of Stock Option Plans			2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value			$ 11,200,000	$ 24,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number | shares			917,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value			$ 11,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term			3 years 328 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price | $ / shares			$ 23.17

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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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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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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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