Statements of Stockholders' Equity (Unaudited) (USD $)	Total	Class A voting Common Stock	Capital in Excess of Par Value	Deferred Directors' Compensation	Retained Earnings	Treasury Stock
Balance at Sep. 30, 2010	$ 73,581,996	$ 140,524	$ 1,816,365	$ 2,222,127	$ 73,599,733	$ (4,196,753)
Balance, shares at Sep. 30, 2010		8,431,502				(120,560)
Purchase of treasury stock	(1,851,290)					(1,851,290)
Purchase of treasury stock, shares						(65,481)
Restricted stock awards	105,664		105,664
Net income	5,849,531				5,849,531
Dividends ($.21 per share)	(1,743,075)				(1,743,075)
Increase in deferred directors' compensation charged to expense	330,332			330,332
Balance at Jun. 30, 2011	76,273,158	140,524	1,922,029	2,552,459	77,706,189	(6,048,043)
Balance, shares at Jun. 30, 2011		8,431,502				(186,041)
Balance at Sep. 30, 2011	78,802,317	140,524	1,924,507	2,665,583	79,771,563	(5,699,860)
Balance, shares at Sep. 30, 2011		8,431,502				(175,331)
Purchase of treasury stock	(1,158,957)					(1,158,957)
Purchase of treasury stock, shares						(38,771)
Restricted stock awards	239,858		239,858
Net income	7,188,375				7,188,375
Dividends ($.21 per share)	(1,740,920)				(1,740,920)
Distribution of deferred directors' compensation	83,743		(220,810)	(406,769)		711,322
Distribution of deferred directors' compensation, shares						22,132
Increase in deferred directors' compensation charged to expense	314,655			314,655
Balance at Jun. 30, 2012	$ 83,729,071	$ 140,524	$ 1,943,555	$ 2,573,469	$ 85,219,018	$ (6,147,495)
Balance, shares at Jun. 30, 2012		8,431,502				(191,970)