Statements Of Stockholders' Equity (USD $)	Class A voting Common Stock [Member]	Capital in Excess of Par Value [Member]	Deferred Directors' Compensation [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balances at Sep. 30, 2010	$ 140,524	$ 1,816,365	$ 2,222,127	$ 73,599,733	$ (4,196,753)	$ 73,581,996
Balances, Treasury shares at Sep. 30, 2010					(120,560)
Balances, shares at Sep. 30, 2010	8,431,502
Purchase of treasury stock					(1,851,290)	(1,851,290)
Purchase of treasury stock, shares					(65,481)
Issuance of treasury shares to ESOP		(44,340)			348,183	303,843
Issuance of treasury shares to ESOP, shares					10,710	10,710
Restricted stock awards		152,482				152,482
Common shares to be issued to directors for services			443,456			443,456
Dividends declared ($.28 per share)				(2,322,082)		(2,322,082)
Net income				8,493,912		8,493,912
Balances at Sep. 30, 2011	140,524	1,924,507	2,665,583	79,771,563	(5,699,860)	78,802,317
Balances, Treasury shares at Sep. 30, 2011					(175,331)
Balances, shares at Sep. 30, 2011	8,431,502
Purchase of treasury stock					(1,158,957)	(1,158,957)
Purchase of treasury stock, shares					(38,771)
Issuance of treasury shares to ESOP		(14,391)			341,333	326,942
Issuance of treasury shares to ESOP, shares					10,660	10,660
Restricted stock awards		330,923				330,923
Distribution of deferred directors' compensation		(220,810)	(406,770)		711,322	83,742
Distribution of deferred directors' compensation, shares					22,132
Common shares to be issued to directors for services			417,347			417,347
Dividends declared ($.28 per share)				(2,321,164)		(2,321,164)
Net income				7,370,996		7,370,996
Balances at Sep. 30, 2012	140,524	2,020,229	2,676,160	84,821,395	(5,806,162)	83,852,146
Balances, Treasury shares at Sep. 30, 2012					(181,310)	(181,310)
Balances, shares at Sep. 30, 2012	8,431,502
Purchase of treasury stock					(1,214,638)	(1,214,638)
Purchase of treasury stock, shares					(42,206)
Issuance of treasury shares to ESOP		(33,812)			342,262	308,450
Issuance of treasury shares to ESOP, shares					10,907	10,907
Restricted stock awards		683,968				683,968
Distribution of deferred directors' compensation		(82,547)	(297,154)		394,687	14,986
Distribution of deferred directors' compensation, shares					12,361
Common shares to be issued to directors for services			377,520			377,520
Dividends declared ($.28 per share)				(2,326,995)		(2,326,995)
Net income				13,960,049		13,960,049
Balances at Sep. 30, 2013	$ 140,524	$ 2,587,838	$ 2,756,526	$ 96,454,449	$ (6,283,851)	$ 95,655,486
Balances, Treasury shares at Sep. 30, 2013					(200,248)	(200,248)
Balances, shares at Sep. 30, 2013	8,431,502