Stock Option Plan and Stock Based Compensation (Details 1) (USD $)	6 Months Ended
Aug. 31, 2012	Aug. 31, 2011
Summary of assumptions used and weighted average grant-date fair value of stock options granted
Expected volatility	37.02%	43.76%
Expected term (years)	3 years	3 years
Risk free interest rate	0.43%	1.16%
Dividend yield	4.42%	3.66%
Weighted average grant-date fair value	$ 2.83	$ 4.24

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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