Note 7 - Derivative Liabilities (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Derivative Warrant Liability [Member]
Derivative Liability, Total	$ 1,628,113		$ 1,628,113
Fair Value Adjustment of Derivatives	$ 1,000,000	$ 0	$ 1,000,000	$ 108,944
Series F Warrant [Member]
Class of Warrants and Rights, Required Cash Purchase Price (in dollars per share)	$ 0.18		$ 0.18
Series G Warrant [Member]
Class of Warrants and Rights, Required Cash Purchase Price (in dollars per share)	0.11		0.11
Series H Warrant [Member]
Class of Warrants and Rights, Required Cash Purchase Price (in dollars per share)	$ 0.0533		$ 0.0533