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Quarterly Financial Data (unaudited) (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Quarterly Financial Data (unaudited)                      
Net sales $ 4,225,484 $ 4,541,421 $ 4,653,902 $ 3,365,866 $ 6,220,551 $ 6,504,592 $ 8,660,982 $ 6,583,578 $ 16,786,674 $ 27,969,703 $ 20,067,084
Cost of sales 2,373,726 2,164,140 2,302,431 1,828,052 2,835,905 2,621,016 2,757,635 3,267,767 8,668,348 11,482,323 13,135,349
Gross profit 1,851,758 2,377,281 2,351,471 1,537,814 3,384,646 3,883,576 5,903,347 3,315,811 8,118,326 16,487,380 6,931,735
Operating (loss) income (926,999) (541,189) 2,985,918 (1,595,295) 546,460 232,344 1,973,116 (308,733) (77,565) 2,443,187 (3,620,743)
Net (loss) income $ (186,045) $ 19,220 $ 5,930,425 $ (1,194,974) $ 397,129 $ 226,797 $ 1,578,313 $ (215,438) $ 4,568,627 $ 1,986,801 $ (5,866,134)
Net income (loss) per common share:                      
Basic (in dollars per share) $ (0.01)   $ 0.35 $ (0.07) $ 0.02 $ 0.01 $ 0.09 $ (0.01) $ 0.27 $ 0.12 $ (0.35)
Diluted (in dollars per share) $ (0.01)   $ 0.35 $ (0.07) $ 0.02 $ 0.01 $ 0.09 $ (0.01) $ 0.27 $ 0.12 $ (0.35)