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Stock Compensation - Share-based Compensation and Income Taxes (Details) (USD $)
12 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 29, 2012
Share based compensation expense and related income tax benefits      
Compensation Expense $ 3,703,407 $ 3,175,050 $ 2,927,917
Income tax benefits $ 1,296,193 $ 1,111,268 $ 1,024,771