Statements of Stockholders' Equity (Unaudited June 30, 2013 and June 30, 2012) (USD $)	Common Class A [Member]	Additional Paid-in Capital [Member]	Deferred Compensation, Share-based Payments [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance at Sep. 30, 2011	$ 140,524	$ 1,924,507	$ 2,665,583	$ 79,771,563	$ (5,699,860)	$ 78,802,317
Balance (in Shares) at Sep. 30, 2011	8,431,502				(175,331)
Purchase of treasury stock	0	0	0	0	(1,158,957)	(1,158,957)
Purchase of treasury stock (in Shares)	0				(38,771)
Restricted stock awards	0	239,858	0	0	0	239,858
Restricted stock awards (in Shares)	0				0
Net income	0	0	0	7,188,375	0	7,188,375
Net Income (in Shares)	0				0
Dividends	0	0	0	(1,740,920)	0	(1,740,920)
Dividends (in Shares)	0				0
Distribution of deferred directors' compensation	0	(220,810)	(406,769)	0	711,322	83,743
Distribution of deferred directors' compensation (in Shares)	0				22,132
Increase in deferred directors' compensation charged to expense	0	0	314,655	0	0	314,655
Increase in deferred directors' compensation charged to expense (in Shares)	0				0
Balance at Jun. 30, 2012	140,524	1,943,555	2,573,469	85,219,018	(6,147,495)	83,729,071
Balance (in Shares) at Jun. 30, 2012	8,431,502				(191,970)
Balance at Sep. 30, 2012	140,524	2,020,229	2,676,160	84,821,395	(5,806,162)	83,852,146
Balance (in Shares) at Sep. 30, 2012	8,431,502				(181,310)
Purchase of treasury stock	0	0	0	0	(1,214,638)	(1,214,638)
Purchase of treasury stock (in Shares)	0				(42,206)
Restricted stock awards	0	541,937	0	0	0	541,937
Restricted stock awards (in Shares)	0				0
Net income	0	0	0	8,240,953	0	8,240,953
Net Income (in Shares)	0				0
Dividends	0	0	0	(1,746,217)	0	(1,746,217)
Dividends (in Shares)	0				0
Distribution of deferred directors' compensation	0	(82,547)	(297,154)	0	394,687	14,986
Distribution of deferred directors' compensation (in Shares)	0				12,361
Increase in deferred directors' compensation charged to expense	0	0	288,759	0	0	288,759
Increase in deferred directors' compensation charged to expense (in Shares)	0				0
Balance at Jun. 30, 2013	$ 140,524	$ 2,479,619	$ 2,667,765	$ 91,316,131	$ (6,626,113)	$ 89,977,926
Balance (in Shares) at Jun. 30, 2013	8,431,502				(211,155)