Quarterly report pursuant to Section 13 or 15(d)

Description of Business and Significant Accounting Policies (Tables)

 v2.3.0.11
Description of Business and Significant Accounting Policies (Tables)
 3 Months Ended
Aug. 31, 2011
Description of Business and Significant Accounting Policies [Abstract]  
Weighted-average assumptions used for valuation under the Black - Scholes model
                 
    For the three months ended
    August 31,
    2011     2010  
 
Risk-free interest rate
    2.2 %     2.5 %
Dividend yield
    4.2 %     4.2 %
Volatility factor
    .23       .24  
Expected option life in years
    5.9       6.5