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	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
– basic (in shares)	7,963,775	6,736,643
Effect of dilutive options and warrants (treasury method) (in shares)	372,253
– diluted (in shares)	8,336,028	6,736,643
Options, warrants and convertible shares outstanding during each period, but not included in the computation of diluted net loss per share because they are antidilutive (in shares)	1,132,365	2,124,738