Note 3 - Income Taxes - Income Tax Expense (Benefit) Components (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Federal	$ 5,154,287	$ 1,966,491
State	439,944	175,201
Current income tax expense	5,594,231	2,141,692
Federal	(234,297)	(252,929)
State	46,947	(26,879)
Deferred income tax expense	(187,350)	(279,808)
Income tax expense	$ 5,406,881	$ 1,861,884