Note 3 - Income Taxes - Income Tax Expense (Benefit) Components (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Federal	$ 1,966,491	$ 1,260,552
State	175,201	103,130
Current income tax expense	2,141,692	1,363,682
Federal	(252,929)	(38,534)
State	(26,879)	35,289
Deferred income tax expense	(279,808)	(3,245)
Income tax expense	$ 1,861,884	$ 1,360,437