Stock Option Plan and Stock Based Compensation - Stock Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Shares, Options Outstanding, Beginning Balance	369,405	363,000	310,193
Number of Shares, Granted	31,418	36,155	72,707
Number of Shares, Terminated	(20,000)	(7,750)	(11,400)
Number of Shares, Exercised	(6,000)	(22,000)	(8,500)
Number of Shares, Options Outstanding, Ending Balance	374,823	369,405	363,000	310,193
Weighted Average Exercise Price, Beginning Balance	$ 15.86	$ 15.79	$ 15.60
Weighted Average Exercise Price, Granted	$ 15.78	$ 14.05	$ 15.48
Weighted Average Exercise Price, Terminated	$ 16.21	$ 13.30	$ 13.57
Weighted Average Exercise Price, Exercised	$ 8.94	$ 12.59	$ 8.94
Weighted Average Exercise Price, Ending Balance	$ 15.95	$ 15.86	$ 15.79	$ 15.60
Aggregate Intrinsic Value, Beginning Balance	$ 416	$ 421	$ 626
Weighted Average Remaining Contractual Life, Ending Balance	5 years 8 months 12 days	6 years	6 years 4 months 24 days	6 years 7 months 6 days
Aggregate Intrinsic Value, Ending Balance	210	416	421	626
Number of Shares, Exercisable	295,063
Weighted Average Exercise Price, Exercisable	$ 16.16
Weighted Average Remaining Contractual Life, Exercisable	5 years
Aggregate Intrinsic Value, Exercisable	$ 210

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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 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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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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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