Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2011	Sep. 30, 2010
Stockholders' equity:
Common stock, par value	$ 0.0166	$ 0.0166
Common stock, shares authorized	24,000,000	24,000,000
Common stock, shares issued	8,431,502	8,431,502
Treasury stock, shares	175,331	120,560