Note 3 - Stock-based Compensation (Detail) - Black-Scholes Option-Pricing Model Assumptions:	9 Months Ended
Mar. 31, 2013
Risk free interest rate	1.60%
Option life (in years)	10 years
Dividend yield	7.04%
Volatility	32.68%

- Definition

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.

+ References+ Details