Note 1 - Basis of Presentation and Significant Accounting Policies - Computation of Basic and Diluted Weighted Average Shares Used in Earnings Per Share Calculations (Details) - shares	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Denominator for basic earnings (loss) per share - weighted average common shares (in shares)	8,230,100	7,216,135
Effect of dilutive options and warrants (treasury method) (in shares)	420,284	0
Denominator for diluted earnings (loss) per share - adjusted weighted average common shares (in shares)	8,650,384	7,216,135
Options and warrants outstanding during each year, but not included in the computation of diluted earnings (loss) per share because they are antidilutive (in shares)	1,333,174	2,006,073