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, 2013	$ 280,938	$ 2,447,424	$ 2,756,526	$ 96,454,449	$ (6,283,851)	$ 95,655,486
Balances, Treasury shares at Sep. 30, 2013					(400,496)
Balances, shares at Sep. 30, 2013	16,863,004
Purchase of treasury stock					(122,044)	(122,044)
Purchase of treasury stock, shares					(7,444)
Restricted stock awards		262,174				262,174
Net income				10,580,891		10,580,891
Dividends ($.08 per share)				(1,330,215)		(1,330,215)
Distribution of restricted stock to officers and directors		(259,511)			275,662	16,151
Distribution of restricted stock to officers and directors, shares					18,280
Increase in deferred directors' compensation charged to expense			189,506			189,506
Balances at Mar. 31, 2014	280,938	2,450,087	2,946,032	105,705,125	(6,130,233)	105,251,949
Balances, Treasury shares at Mar. 31, 2014					(389,660)
Balances, shares at Mar. 31, 2014	16,863,004
Balances at Sep. 30, 2014	280,938	2,861,343	3,110,351	118,794,188	(5,858,167)	119,188,653
Balances, Treasury shares at Sep. 30, 2014					(372,364)	(372,364)
Balances, shares at Sep. 30, 2014	16,863,004
Purchase of treasury stock					(120,611)	(120,611)
Purchase of treasury stock, shares					(7,177)
Restricted stock awards		531,243				531,243
Net income				10,937,968		10,937,968
Dividends ($.08 per share)				(1,333,023)		(1,333,023)
Distribution of restricted stock to officers and directors		(476,423)			417,665	(58,758)
Distribution of restricted stock to officers and directors, shares					26,533
Distribution of deferred directors' compensation		16,045	(328,415)		352,359	39,989
Distribution of deferred directors' compensation, shares					22,372
Increase in deferred directors' compensation charged to expense			169,464			169,464
Balances at Mar. 31, 2015	$ 280,938	$ 2,932,208	$ 2,951,400	$ 128,399,133	$ (5,208,754)	$ 129,354,925
Balances, Treasury shares at Mar. 31, 2015					(330,636)	(330,636)
Balances, shares at Mar. 31, 2015	16,863,004