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, 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)
Balances, shares at Sep. 30, 2012	8,431,502
Purchase of treasury stock					(116,632)	(116,632)
Purchase of treasury stock, shares					(4,198)
Restricted stock awards		257,877				257,877
Distribution of deferred directors' compensation		(82,547)	(297,140)		394,687	15,000
Distribution of deferred directors' compensation, shares					12,361
Increase in deferred directors' compensation charged to expense			114,164			114,164
Dividends				(1,164,429)		(1,164,429)
Net income				2,148,298		2,148,298
Balances at Dec. 31, 2012	140,524	2,195,559	2,493,184	85,805,264	(5,528,107)	85,106,424
Balances, Treasury shares at Dec. 31, 2012					(173,147)
Balances, shares at Dec. 31, 2012	8,431,502
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
Purchase of treasury stock					(122,044)	(122,044)
Purchase of treasury stock, shares					(3,722)
Restricted stock awards		127,976				127,976
Distribution of deferred directors' compensation		(259,511)			275,662	16,151
Distribution of deferred directors' compensation, shares					9,140
Increase in deferred directors' compensation charged to expense			114,069			114,069
Dividends				(1,328,272)		(1,328,272)
Net income				4,926,318		4,926,318
Balances at Dec. 31, 2013	$ 140,524	$ 2,456,303	$ 2,870,595	$ 100,052,495	$ (6,130,233)	$ 99,389,684
Balances, Treasury shares at Dec. 31, 2013					(194,830)	(194,830)
Balances, shares at Dec. 31, 2013	8,431,502