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Note 16 - Employee Benefit Plans (Detail) - Option Valuation Assumptions	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Expected volatility	0.47%	0.44%	0.52%
Expected dividends	1.48%	1.53%	1.28%
Expected term (in years)	4 years 255 days	4 years 219 days	4 years 146 days
Risk free rate	0.85%	1.73%	1.62%

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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