Note 1 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Balance at Beginning of Year	$ 79,000	$ 289,000
Additions Charged to Costs and Expenses	0	(210,000)
Less Write-offs	0	0
Balance at End of Year	$ 79,000	$ 79,000