Note 8 - Shareholders' Equity (Tables)

9 Months Ended

Jun. 30, 2022

Notes Tables

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	June 30,			June 30,
	2022			2021
Weighted average exercise price	0.844 -1.0000			$	3.91
Risk free interest rate		2.56% - 2.83%			0.16% - 0.85%
Volatility		101.23	% - 102.00		100.72% - 105.43%
Expected term (in years)		2.5 - 4			2.5 - 6.2
Dividend yield	None			None

Fair Value Assumption of Warrants [Member]

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	June 30,
	2021
Weighted average exercise price	$	3.74
Risk free interest rate		0.39	%
Volatility		103.42	%
Expected term (in years)		2.8
Dividend yield	None