Statements of Stockholders' Equity (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	(1,264,965)					(1,264,965)
Purchase of treasury stock, shares						(45,682)
Restricted stock awards	58,846		58,846
Net income	3,199,102				3,199,102
Dividends ($.14 per share)	(1,163,329)				(1,163,329)
Increase in deferred directors' compensation charged to expense	235,950			235,950
Balance at Mar. 31, 2011	74,647,600	140,524	1,875,211	2,458,077	75,635,506	(5,461,718)
Balance, shares at Mar. 31, 2011		8,431,502				(166,242)
Balance at Sep. 30, 2011	78,802,317	140,524	1,924,507	2,665,583	79,771,563	(5,699,860)
Balance, shares at Sep. 30, 2011		8,431,502				(175,331)
Purchase of treasury stock	(1,158,957)					(1,158,957)
Purchase of treasury stock, shares						(38,771)
Restricted stock awards	148,793		148,793
Net income	4,088,076				4,088,076
Dividends ($.14 per share)	(1,160,675)				(1,160,675)
Distribution of deferred directors' compensation	75,254		(229,296)	(406,772)		711,322
Distribution of deferred directors' compensation, shares						22,132
Increase in deferred directors' compensation charged to expense	216,727			216,727
Balance at Mar. 31, 2012	$ 81,011,535	$ 140,524	$ 1,844,004	$ 2,475,538	$ 82,698,964	$ (6,147,495)
Balance, shares at Mar. 31, 2012		8,431,502				(191,970)