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, 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)
Net income (loss)	3,531,933				3,531,933
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
Dividends declared ($0.16 per share)	(2,684,001)				(2,684,001)
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
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)
Net income (loss)	14,635,669				14,635,669
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
Dividends declared ($0.16 per share)	(2,698,940)				(2,698,940)
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
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)
Net income (loss)	$ (40,744,938)				(40,744,938)
Purchase of treasury stock	(7,454,000)					$ (7,454,000)
Purchase of treasury stock, shares						(515,972)
Issuance of treasury shares to ESOP	372,274		(25,830)			$ 398,104
Issuance of treasury shares to ESOP, shares						26,629
Restricted stock awards	771,797		771,797
Dividends declared ($0.16 per share)	(2,673,706)				(2,673,706)
Distribution of restricted stock to officers and directors	413	$ 7	(394,824)			$ 395,230
Distribution of restricted stock to officers and directors, shares		425				24,360
Distribution of deferred directors' compensation	(3)		(207,850)	(667,115)		$ 874,962
Distribution of deferred directors' compensation, shares						52,399
Common shares to be issued to directors for services	272,491			272,491
Balances at Sep. 30, 2019	$ 79,309,533	$ 281,509	$ 2,967,984	$ 2,555,781	$ 81,848,301	$ (8,344,042)
Balances, shares at Sep. 30, 2019		16,897,306
Balances, Treasury shares at Sep. 30, 2019	(558,051)					(558,051)