Statements Of Stockholders' Equity - USD ($)	Total	Class A voting Common Stock [Member]	Capital in Excess of Par Value [Member]	Deferred Directors' Compensation [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Balances at Sep. 30, 2014	$ 119,188,653	$ 280,938	$ 2,861,343	$ 3,110,351	$ 118,794,188	$ (5,858,167)
Balances, shares at Sep. 30, 2014		16,863,004
Balances, Treasury shares at Sep. 30, 2014						(372,364)
Purchase of treasury stock	(242,313)					$ (242,313)
Purchase of treasury stock, shares						(12,719)
Issuance of treasury shares to ESOP	185,113		3,437			$ 181,676
Issuance of treasury shares to ESOP, shares						11,455
Restricted stock awards	895,127		895,127
Distribution of restricted stock to officers and directors	(16,531)		(782,832)			$ 766,301
Distribution of restricted stock to officers and directors, shares						48,633
Distribution of deferred directors' compensation	39,988		16,044	(328,415)		$ 352,359
Distribution of deferred directors' compensation, shares						22,372
Common shares to be issued to directors for services	302,353			302,353
Dividends declared ($0.16 per share)	(2,669,056)				(2,669,056)
Net income (loss)	9,321,341				9,321,341
Balances at Sep. 30, 2015	127,004,675	$ 280,938	2,993,119	3,084,289	125,446,473	$ (4,800,144)
Balances, shares at Sep. 30, 2015		16,863,004
Balances, Treasury shares at Sep. 30, 2015						(302,623)
Purchase of treasury stock	(117,165)					$ (117,165)
Purchase of treasury stock, shares						(7,477)
Issuance of treasury shares to ESOP	200,158		19,068			$ 181,090
Issuance of treasury shares to ESOP, shares						11,418
Restricted stock awards	781,479		781,479
Distribution of restricted stock to officers and directors	(42,604)		(601,779)			$ 559,175
Distribution of restricted stock to officers and directors, shares						35,257
Distribution of deferred directors' compensation			(831)	(10,541)		$ 11,372
Distribution of deferred directors' compensation, shares						717
Common shares to be issued to directors for services	329,465			329,465
Dividends declared ($0.16 per share)	(2,677,305)				(2,677,305)
Net income (loss)	(10,286,884)				(10,286,884)
Balances at Sep. 30, 2016	$ 115,191,819	$ 280,938	3,191,056	3,403,213	112,482,284	$ (4,165,672)
Balances, shares at Sep. 30, 2016		16,863,004
Balances, Treasury shares at Sep. 30, 2016	(262,708)					(262,708)
Purchase of treasury stock	$ (601,853)					$ (601,853)
Purchase of treasury stock, shares						(25,742)
Issuance of treasury shares to ESOP	312,380		93,192			$ 219,188
Issuance of treasury shares to ESOP, shares						13,125
Restricted stock awards	597,940		597,940
Distribution of restricted stock to officers and directors	663		(1,010,275)			$ 1,010,938
Distribution of restricted stock to officers and directors, shares						63,121
Distribution of deferred directors' compensation			(145,469)	(301,962)		$ 447,431
Distribution of deferred directors' compensation, shares						27,216
Common shares to be issued to directors for services	358,658			358,658
Dividends declared ($0.16 per share)	(2,684,001)				(2,684,001)
Net income (loss)	3,531,933				3,531,933
Balances at Sep. 30, 2017	$ 116,707,539	$ 280,938	$ 2,726,444	$ 3,459,909	$ 113,330,216	$ (3,089,968)
Balances, shares at Sep. 30, 2017		16,863,004
Balances, Treasury shares at Sep. 30, 2017	(184,988)					(184,988)