Note 8 - Stock-based Compensation - Summary of the Status of the Company's Stock Options (Details)	6 Months Ended
	Mar. 31, 2017 $ / shares shares
Outstanding (in shares) | shares	570,000
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 2.73
Granted (in shares) | shares	90,000
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 1.81
Exercised (in shares) | shares
Exercised, weighted average exercise price (in dollars per share) | $ / shares
Expired (in shares) | shares	(10,000)
Expired, weighted average exercise price (in dollars per share) | $ / shares	$ 3.45
Forfeited (in shares) | shares
Forfeited, weighted average exercise price (in dollars per share) | $ / shares
Outstanding (in shares) | shares	650,000
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 2.59
Exercisable (in shares) | shares	393,334
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 2.79