Earnings Per Share (Details) (USD $)	3 Months Ended
May 31, 2013	May 31, 2012
Numerator:
Net income for basic and diluted earnings per common share	$ 14,546,783	$ 15,985,940
Denominator:
Denominator for basic earnings per common share-weighted average shares (shares)	25,463,942	25,243,950
Effect of dilutive securities:
Employee and Director stock awards (shares)	201,390	209,881
Denominator for diluted earnings per common share (shares)	25,665,332	25,453,831
Earnings per share basic and diluted:
Basic earnings per Common share (usd per share)	$ 0.57	$ 0.63
Diluted earnings per common share (usd per share)	$ 0.57	$ 0.63

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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