Income Taxes (Summary of Difference Between Provision for Income Taxes and Amount which Would Result from Application of Federal Statutory Rate) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Provision for income taxes at statutory rate	$ 908,698	$ 3,917,815	$ 5,168,366
Change in valuation allowance	(953)	(8,067)	(1,313,271)
Percentage depletion	(150,528)	(408,729)	(602,490)
State income taxes, net of federal provision	138,573	963,063	863,042
Restricted stock tax benefit	93,000	10,664	59,000
Deferred directors’ compensation benefit		42,018	64,000
Nondeductible compensation		122,204
Law change			(56,094)
Other	(7,790)	96,492	19,447
Provision (benefit) for income taxes	$ 981,000	$ 4,735,460	$ 4,202,000