Income Taxes (Summary of Difference Between Provision (Benefit) for Income Taxes and Amount which Would Result from Application of Federal Statutory Rate) (Details) - USD ($)		12 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes at statutory rate		$ (11,387,447)	$ 465,253	$ 1,477,327
Percentage depletion		(431,340)	(577,780)	(570,801)
State income taxes, net of federal provision (benefit)		(1,986,850)	36,980	3,900
Effect of graduated rates				85,644
Restricted stock tax benefit		185,000	(69,000)	(238,000)
Deferred directors compensation benefit		(38,000)	(134,000)	(79,000)
Law change	[1]		(12,464,000)
Other		177,637	3,547	9,930
Provision (benefit) for income taxes		$ (13,481,000)	$ (12,739,000)	$ 689,000

[1] This is the tax effect of the Tax Cuts and Jobs Act (enacted in December 2017) on our deferred tax liabilities. This Act reduced the U.S. federal corporate tax rate from 35% to 21%.