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, 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)
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)
Purchase of treasury stock	$ (1,219,228)					$ (1,219,228)
Purchase of treasury stock, shares						(63,404)
Issuance of treasury shares to ESOP	382,174		19,509			$ 362,665
Issuance of treasury shares to ESOP, shares						20,632
Restricted stock awards	655,414		655,414
Distribution of restricted stock to officers and directors	862	$ 21	(845,788)			$ 846,629
Distribution of restricted stock to officers and directors, shares		1,278				50,455
Distribution of deferred directors' compensation		$ 543	269,112	(811,219)		$ 541,564
Distribution of deferred directors' compensation, shares		32,599				31,838
Common shares to be issued to directors for services	301,715			301,715
Dividends declared ($0.16 per share)	(2,698,940)				(2,698,940)
Net income (loss)	14,635,669				14,635,669
Balances at Sep. 30, 2018	$ 128,765,205	$ 281,502	$ 2,824,691	$ 2,950,405	$ 125,266,945	$ (2,558,338)
Balances, shares at Sep. 30, 2018		16,896,881
Balances, Treasury shares at Sep. 30, 2018	(145,467)					(145,467)