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Note 4 - Stock Based Compensation
9 Months Ended
Aug. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
(4)
Stock Based Compensation

Stock-based compensation expense reflects the fair value of stock-based awards measured at the grant date and recognized over the relevant vesting period.  We estimate the fair value of each stock-based award on the measurement date using the Black-Scholes option valuation model which incorporates assumptions as to stock price volatility, the expected life of the options, risk-free interest rate, and dividend yield.