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Organization and Accounting Policies (Details 1)	6 Months Ended
Organization and Accounting Policies (Details 1)	Mar. 31, 2013	Mar. 31, 2012
Fair value of each option grant
Dividend yield	5.74%	6.43%
Expected volatility	18.84%	19.24%
Risk-free interest rate	1.18%	1.41%
Expected lives (years)	8 years	8 years
Estimated forfeitures	0	0

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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