Note 11 - Stock-based Compensation - Summary of the Status of the Company's Stock Options (Details)	12 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares
Outstanding (in shares) | shares	290,000
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 2.40
Granted (in shares) | shares	480,000
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 1.32
Exercised (in shares) | shares
Exercised, weighted average exercise price (in dollars per share) | $ / shares
Exercised, aggregate intrinsic value | $
Expired (in shares) | shares
Expired, weighted average exercise price (in dollars per share) | $ / shares
Forfeited (in shares) | shares
Forfeited, weighted average exercise price (in dollars per share) | $ / shares
Outstanding (in shares) | shares	770,000
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 1.73
Outstanding, aggregate intrinsic value | $	$ 352,700	[1]
Exercisable (in shares) | shares	443,334
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 1.99
Exercisable, aggregate intrinsic value | $	$ 146,400

[1] For stock options outstanding.