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Net Income Per Share (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (414,378) | $ (1,041,037) | $ (1,316,871) | $ (881,619) | $ (186,045) | $ 19,220 | $ 5,930,425 | $ (1,194,974) | $ (3,653,905) | $ 4,568,627 | $ 1,986,801
Denominator: |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares |  |  |  |  |  |  |  |  | 16,805,991 | 16,742,461 | 16,927,055
Dilutive effect of share-based awards |  |  |  |  |  |  |  |  |  | 113,182 | 112,241
Diluted weighted average shares |  |  |  |  |  |  |  |  | 16,805,991 | 16,855,644 | 17,039,296
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.03) | $ (0.06) | $ (0.08) | $ (0.05) | $ (0.01) |  | $ 0.35 | $ (0.07) | $ (0.22) | $ 0.27 | $ 0.12
Diluted (in dollars per share) | $ (0.03) | $ (0.06) | $ (0.08) | $ (0.05) | $ (0.01) |  | $ 0.35 | $ (0.07) | $ (0.22) | $ 0.27 | $ 0.12
Options to purchase common stock outstanding (in shares) | 550,834 |  |  |  | 586,834 |  |  |  | 550,834 | 586,834 | 589,168
Anti-dilutive options to purchase common stock excluded from the computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  |  | 336,961 | 339,581
Delta | Other income |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Reminder of amount paid |  |  |  |  |  |  |  |  | $ 4,100,000 | $ 4,100,000 |
RSU |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Restricted stock units outstanding ( in shares) | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0

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