Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stock-based Compensation - Option Transaction Summary (Details)

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Note 4 - Stock-based Compensation - Option Transaction Summary (Details) - $ / shares
6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Options, outstanding (in shares) 138,500  
Weighted-average exercise price, outstanding (in dollars per share) $ 10.99  
Granted (in shares) 172,000 0
Weighted-average exercise price, Granted (in dollars per share) $ 12.17  
Exercised (in shares) (6,750) (6,100)
Weighted-average exercise price, Exercised (in dollars per share) $ 2.58  
Cancelled or Forfeited (in shares)  
Weighted-average exercise price, Cancelled or Forfeited (in dollars per share)  
Options, outstanding (in shares) 303,750  
Weighted-average exercise price, outstanding (in dollars per share) $ 11.85