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, shares at Sep. 30, 2013	16,863,004
Balances, Treasury shares at Jun. 30, 2014					(385,748)
Balances at Sep. 30, 2013	$ 280,938	$ 2,447,424	$ 2,756,526	$ 96,454,449	$ (6,283,851)	$ 95,655,486
Purchase of treasury stock					$ (122,044)	(122,044)
Purchase of treasury stock, shares					(7,444)
Restricted stock awards		499,791				499,791
Net income				15,703,476		15,703,476
Dividends ($.12 per share)				(1,995,812)		(1,995,812)
Distribution of restricted stock to officers and directors		(320,014)			$ 337,198	17,184
Distribution of restricted stock to officers and directors, shares					22,192
Increase in deferred directors' compensation charged to expense			269,608			269,608
Balances, shares at Jun. 30, 2014	16,863,004
Balances, Treasury shares at Sep. 30, 2013					(400,496)
Balances at Jun. 30, 2014	$ 280,938	2,627,201	3,026,134	110,162,113	$ (6,068,697)	$ 110,027,689
Balances, shares at Sep. 30, 2014	16,863,004
Balances, Treasury shares at Jun. 30, 2015					(316,628)	(316,628)
Balances at Sep. 30, 2014	$ 280,938	2,861,343	3,110,351	118,794,188	$ (5,858,167)	$ 119,188,653
Purchase of treasury stock					$ (242,313)	(242,313)
Purchase of treasury stock, shares					(12,719)
Restricted stock awards		740,043				740,043
Net income				10,209,022		10,209,022
Dividends ($.12 per share)				(2,001,150)		(2,001,150)
Distribution of restricted stock to officers and directors		(738,432)			$ 725,858	(12,574)
Distribution of restricted stock to officers and directors, shares					46,083
Distribution of deferred directors' compensation		16,046	(328,415)		$ 352,358	39,989
Distribution of deferred directors' compensation, shares					22,372
Increase in deferred directors' compensation charged to expense			232,088			$ 232,088
Balances, shares at Jun. 30, 2015	16,863,004
Balances, Treasury shares at Sep. 30, 2014					(372,364)	(372,364)
Balances at Jun. 30, 2015	$ 280,938	$ 2,879,000	$ 3,014,024	$ 127,002,060	$ (5,022,264)	$ 128,153,758