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, 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	(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)
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	(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)
Net income (loss)	$ (23,952,037)				(23,952,037)
Purchase of treasury stock	(7,635)					$ (7,635)
Purchase of treasury stock, shares						(632)
Issuance of treasury shares to ESOP	103,104		(974,806)			$ 1,077,910
Issuance of treasury shares to ESOP, shares						72,101
Restricted stock awards	743,897		743,897
Dividends declared	(1,652,164)				(1,652,164)
Distribution of restricted stock to officers and directors	94		(82,820)			$ 82,914
Distribution of restricted stock to officers and directors, shares						5,546
Distribution of deferred directors' compensation			(129,575)	(910,182)		$ 1,039,757
Distribution of deferred directors' compensation, shares						69,549
Common shares to be issued to directors for services	228,408			228,408
Equity offering	8,220,726	$ 95,795	8,124,931
Equity offering, shares		5,750,000
Balances at Sep. 30, 2020	$ 62,993,926	$ 377,304	$ 10,649,611	$ 1,874,007	$ 56,244,100	$ (6,151,096)
Balances, shares at Sep. 30, 2020		22,647,306
Balances, Treasury shares at Sep. 30, 2020	(411,487)					(411,487)