Earnings Per Share (Details) (USD $)	3 Months Ended	12 Months Ended
Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 29, 2012	Nov. 30, 2011	Aug. 31, 2011	May 31, 2011	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Computation for basic and diluted earnings per share
Basic weighted average common shares outstanding									26,035,571	25,946,107	25,855,129
Effect of dilutive options									17,881	21,570	32,866
Diluted weighted average common shares outstanding									26,053,452	25,967,677	25,887,995
Per share amounts:
Net earnings - basic	$ 0.27	$ 0.24	$ 0.29	$ 0.15	$ 0.13	$ 0.27	$ 0.37	$ 0.44	$ 0.95	$ 1.21	$ 1.73
Net earnings - diluted	$ 0.27	$ 0.24	$ 0.29	$ 0.15	$ 0.13	$ 0.27	$ 0.37	$ 0.44	$ 0.95	$ 1.21	$ 1.72
Cash dividends	$ 0.35	$ 0.175	$ 0.175	$ 0.175	$ 0.155	$ 0.155	$ 0.155	$ 0.155	$ 0.88	$ 0.62	$ 0.62

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References+ Details

- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

+ References

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+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References+ Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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-URI http://asc.fasb.org/extlink&oid=6528421

+ Details