Statements of Stockholders' Equity (Unaudited) (USD $)	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012	Sep. 30, 2011
Balance	$ 85,106,424	$ 81,230,957	$ 83,852,146	$ 78,802,317
Purchase of treasury stock	(116,632)
Restricted stock awards	257,877	57,729
Net income	2,148,298	3,412,110
Dividends	(1,164,429)	(1,161,075)
Distribution of deferred directors' compensation	15,000
Increase in deferred directors' compensation charged to expense	114,164	119,876
Common Class A [Member]
Balance	140,524	140,524	140,524	140,524
Balance (in Shares)	8,431,502	8,431,502	8,431,502	8,431,502
Additional Paid-in Capital [Member]
Balance	2,195,559	1,982,236	2,020,229	1,924,507
Restricted stock awards	257,877	57,729
Distribution of deferred directors' compensation	(82,547)
Deferred Compensation, Share-based Payments [Member]
Balance	2,493,184	2,785,459	2,676,160	2,665,583
Distribution of deferred directors' compensation	(297,140)
Increase in deferred directors' compensation charged to expense	114,164	119,876
Retained Earnings [Member]
Balance	85,805,264	82,022,598	84,821,395	79,771,563
Net income	2,148,298	3,412,110
Dividends	(1,164,429)	(1,161,075)
Treasury Stock [Member]
Balance	(5,528,107)	(5,699,860)	(5,806,162)	(5,699,860)
Balance (in Shares)	(173,147)	(175,331)	(181,310)	(175,331)
Purchase of treasury stock	(116,632)
Purchase of treasury stock (in Shares)	(4,198)
Distribution of deferred directors' compensation	$ 394,687
Distribution of deferred directors' compensation (in Shares)	12,361