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Note 16 - Net Income (Loss) Per Share - Basic and Diluted Loss Per Share (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018
Net income (loss) | $ 1,178,850 | $ 1,045,940 | $ 460,908 | $ (1,683,252) | $ 2,224,790 | $ (1,222,344)
Basic income (loss) per share (in dollars per share) | $ 0.04 |  | $ 0.01 |  | $ 0.07 | $ (0.04)
Diluted income (loss) per share (in dollars per share) | $ 0.04 |  | $ 0.01 |  | $ 0.07 | $ (0.04)
Weighted average shares outstanding - basic (in shares) | 32,584,952 |  | 32,275,647 |  | 32,738,871 | 32,212,286
Assumed exercise of dilutive options (in shares) | 492,303 |  | 1,023,559 |  | 533,293 |
Weighted average shares outstanding - diluted (in shares) | 33,077,255 |  | 33,299,206 |  | 33,272,164 | 32,212,286
Antidilutive securities (in shares) | 976,750 |  | 1,984,580 |  | 976,750 | 2,924,897
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |
Antidilutive securities (in shares) | 976,750 |  | 1,766,250 |  | 976,750 | 2,706,567
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Antidilutive securities (in shares) |  |  | 218,330 |  |  | 218,330

X
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