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, 2011	$ 280,938	$ 1,784,093	$ 2,665,583	$ 79,771,563	$ (5,699,860)	$ 78,802,317
Balances, Treasury shares at Sep. 30, 2011					(350,662)
Balances, shares at Sep. 30, 2011	16,863,004
Purchase of treasury stock					(1,158,957)	(1,158,957)
Purchase of treasury stock, shares					(77,542)
Issuance of treasury shares to ESOP		(14,391)			341,333	326,942
Issuance of treasury shares to ESOP, shares					21,320	21,320
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					44,264
Common shares to be issued to directors for services			417,347			417,347
Dividends declared				(2,321,164)		(2,321,164)
Net income				7,370,996		7,370,996
Balances at Sep. 30, 2012	280,938	1,879,815	2,676,160	84,821,395	(5,806,162)	83,852,146
Balances, Treasury shares at Sep. 30, 2012					(362,620)
Balances, shares at Sep. 30, 2012	16,863,004
Purchase of treasury stock					(1,214,638)	(1,214,638)
Purchase of treasury stock, shares					(84,412)
Issuance of treasury shares to ESOP		(33,812)			342,262	308,450
Issuance of treasury shares to ESOP, shares					21,814	21,814
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					24,722
Common shares to be issued to directors for services			377,520			377,520
Dividends declared				(2,326,995)		(2,326,995)
Net income				13,960,049		13,960,049
Balances at Sep. 30, 2013	280,938	2,447,424	2,756,526	96,454,449	(6,283,851)	95,655,486
Balances, Treasury shares at Sep. 30, 2013					(400,496)	(400,496)
Balances, shares at Sep. 30, 2013	16,863,004
Purchase of treasury stock					(122,044)	(122,044)
Purchase of treasury stock, shares					(7,444)
Issuance of treasury shares to ESOP		161,363			179,762	341,125
Issuance of treasury shares to ESOP, shares					11,428	11,428
Restricted stock awards		659,320				659,320
Distribution of restricted stock to officers and directors		(406,764)			367,966	(38,798)
Distribution of restricted stock to officers and directors, shares					24,148
Common shares to be issued to directors for services			353,825			353,825
Dividends declared				(2,661,723)		(2,661,723)
Net income				25,001,462		25,001,462
Balances at Sep. 30, 2014	$ 280,938	$ 2,861,343	$ 3,110,351	$ 118,794,188	$ (5,858,167)	$ 119,188,653
Balances, Treasury shares at Sep. 30, 2014					(372,364)	(372,364)
Balances, shares at Sep. 30, 2014	16,863,004