Note 9 - Equity - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Shares Outstanding (in shares)	1,850,000	1,050,000
Outstanding, weighted average exercise price (in dollars per share)	$ 1.99	$ 1.64
Outstanding, weighted average contractual term (Year)	3 years 6 months	4 years 2 months 12 days	4 years 4 months 24 days
Shares Granted (in shares)	0	1,000,000
Granted, weighted average exercise price (in dollars per share)		$ 2.25
Granted, weighted average contractual term (Year)		5 years
Shares Forfeited (in shares)		(200,000)
Forfeited, weighted average exercise price (in dollars per share)		$ 1.50
Shares Expired (in shares)	(150,000)
Expired, weighted average exercise price (in dollars per share)	$ 2.50
Expired, weighted average contractual term (Year)	2 years 6 months
Shares Outstanding (in shares)	1,700,000	1,850,000	1,050,000
Outstanding, weighted average exercise price (in dollars per share)	$ 1.94	$ 1.99	$ 1.64
Shares Vested and expected to vest (in shares)	1,700,000
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 1.94
Vested and expected to vest, weighted average contractual term (Year)	3 years 6 months
Shares Exercisable (in shares)	1,700,000
Exercisable, weighted average exercise price (in dollars per share)	$ 1.94
Exercisable, weighted average contractual term (Year)	3 years 6 months