Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stock-based Compensation - Stock Option Activity (Details)

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Note 4 - Stock-based Compensation - Stock Option Activity (Details) - $ / shares
6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Options, outstanding (in shares) 54,800  
Weighted-average exercise price, outstanding (in dollars per share) $ 3.13  
Exercised (in shares) (15,750) (57,050)
Exercised (in dollars per share) $ 3.98  
Options, outstanding (in shares) 39,050  
Weighted-average exercise price, outstanding (in dollars per share) $ 2.78