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Quarterly Financial Data (unaudited) (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
Net sales | $ 3,645,521 | $ 3,389,663 | $ 3,727,204 | $ 3,087,984 | $ 4,225,484 | $ 4,541,421 | $ 4,653,902 | $ 3,365,866 | $ 13,850,372 | $ 16,786,674 | $ 27,969,703
Cost of sales | 1,829,328 | 1,806,980 | 2,082,347 | 1,593,268 | 2,373,726 | 2,164,140 | 2,302,431 | 1,828,052 | 7,311,923 | 8,668,348 | 11,482,323
Gross profit | 1,816,193 | 1,582,683 | 1,644,857 | 1,494,716 | 1,851,758 | 2,377,281 | 2,351,471 | 1,537,814 | 6,538,449 | 8,118,326 | 16,487,380
Operating (loss) income | (444,240) | (1,072,228) | (1,143,511) | (1,051,560) | (926,999) | (541,189) | 2,985,918 | (1,595,295) | (3,711,539) | (77,565) | 2,443,187
Net (loss) income | $ (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
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
Other income | Delta |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per common share |  |  |  |  |  |  |  |  |  |  |
Reminder of amount paid |  |  |  |  |  |  |  |  | $ 4,100,000 | $ 4,100,000 |

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