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Note 16 - Net Income (Loss) Per Share - Basic and Diluted Loss Per Share (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018
Net income (loss) | $ 638,041 | $ 1,178,850 | $ 1,045,940 | $ (80,219) | $ 460,908 | $ (1,683,252) | $ 2,862,831 | $ (1,302,564)
Basic (in dollars per share) | $ 0.02 |  |  | $ 0 |  |  | $ 0.09 | $ (0.04)
Diluted (in dollars per share) | $ 0.02 |  |  | $ 0 |  |  | $ 0.09 | $ (0.04)
Weighted average shares outstanding - basic (in shares) | 32,575,118 |  |  | 32,306,207 |  |  | 32,684,311 | 32,314,038
Assumed exercise of dilutive options (in shares) | 797,659 |  |  |  |  |  | 656,746 |
Weighted average shares outstanding - diluted (in shares) | 33,372,777 |  |  | 32,306,207 |  |  | 33,341,057 | 32,314,038
Antidilutive securities (in shares) | 761,250 |  |  | 1,984,580 |  |  | 976,750 | 2,924,897
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
Antidilutive securities (in shares) | 761,250 |  |  | 1,766,250 |  |  | 976,750 | 2,706,567
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Antidilutive securities (in shares) |  |  |  | 218,330 |  |  |  | 218,330

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