Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Net Income (Loss) Per Share - Weighted Average Common Shares Outstanding (Details)

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Note 2 - Net Income (Loss) Per Share - Weighted Average Common Shares Outstanding (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Net income $ 367,942 $ (305,376) $ 1,377,902 $ 637,782
Weighted average common shares (in shares) 13,422,222 13,450,482 13,411,183 13,447,178
Dilutive potential common shares (in shares) 27,990 13,995 47,255
Weighted average dilutive common shares outstanding (in shares) 13,450,212 13,450,482 13,425,178 13,494,433
Net income (loss) per common share:        
Basic (in dollars per share) $ 0.02 $ (0.02) $ 0.10 $ 0.05
Diluted (in dollars per share) $ 0.02 $ (0.02) $ 0.10 $ 0.05