Statements Of Changes In Stockholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Retained Earnings [Member]	Other Comprehensive Loss [Member]	Total
Balance at Sep. 30, 2010	$ 9,456	$ 15,192	$ (148)	$ 24,500
Balance (in shares) at Sep. 30, 2010	5,709,839
Net Income		950		950
Dividends paid		(801)		(801)
Unrealized gain on investment in Hennessy Micro Cap Growth Fund, LLC			83	83
Employee and director restricted stock vested	(5)			(5)
Employee and director restricted stock vested (in shares)	33,588
Repurchase of vested employee restricted stock for tax withholding (in shares)	(1,976)
Deferred restricted stock unit compensation	139			139
Tax effect of RSU vesting	(54)			(54)
Balance at Jun. 30, 2011	$ 9,536	$ 15,341	$ (65)	$ 24,812
Balance (in shares) at Jun. 30, 2011	5,741,451