Note 10 - Warrants - Schedule of Equity-Classified Warrants (Details) - $ / shares	Jun. 30, 2022	Sep. 30, 2021
Class of Warrant or Right, Exercisable	660,417
Class of Warrant or Right, Exercisable, Weighted Average Exercise Price	$ 4.60
Warrants to Purchase Common Stock [Member]
Outstanding at September 30, 2021 (in shares)	660,417	660,417
Outstanding at September 30, 2021 (in dollars per share)	$ 4.60	$ 4.60
Outstanding at September 30, 2021 (Year)	2 years 9 months 14 days	3 years 18 days
Class of Warrant or Right, Exercisable	660,417
Class of Warrant or Right, Exercisable, Weighted Average Exercise Price	$ 4.60