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Note 1 - Nature of Operations and Basis of Presentation (Detail) - Stock Options Valuation Assumptions	9 Months Ended
	Nov. 30, 2011
Expected dividend yield	3.87%
Expected stock price volatility	27.00%
Risk-free interest rate	2.00%
Expected life of options (years)	5 years

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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