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Note I - Stock-based Compensation (Details Textual)	1 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2015 shares	May. 31, 2015 shares	Oct. 31, 2015 USD ($)	Oct. 31, 2014 USD ($)	Jan. 31, 2016 USD ($) $ / shares shares	Jan. 31, 2015 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					298,750
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]
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
Allocated Share-based Compensation Expense | $			$ 74,000	$ 68,000
Allocated Share-based Compensation Expense, Net of Tax | $			$ 47,000	$ 43,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $					$ 421,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					4 years 109 days
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 | $					$ 1,100,000	$ 511,000
Allocated Share-based Compensation Expense, Net of Tax | $					710,000	321,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $					$ 3,900,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					3 years 328 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 | $					$ 1,200,000	605,000
Allocated Share-based Compensation Expense, Net of Tax | $					$ 759,000	$ 381,000
Number of Stock Option Plans					2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares					298,750	89,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value | $					$ 5.20	$ 1,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number | shares					904,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value | $					$ 2,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term					3 years 255 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price | $ / shares					$ 23.33
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $					$ 2,900,000	$ 30,500,000

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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 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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