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Note 18 - Quarterly Results of Operations (Unaudited) - Schedule of Quarterly Financial Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2020 | Jul. 31, 2020 | Apr. 30, 2020 | Jan. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2019 | Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018
Net sales | $ 13,887,407 | $ 13,639,169 | $ 14,863,428 | $ 12,887,396 | $ 18,249,535 | $ 17,367,068 | $ 18,957,175 | $ 16,750,668 | $ 55,277,400 | $ 71,324,446 | $ 87,828,590
Gross profit | 4,213,327 | 3,472,161 | 3,996,750 | 2,404,140 | 4,941,600 | 4,491,454 | 5,309,134 | 3,562,559 | 14,086,378 | 18,304,747 | 27,873,200
Selling, general and administrative expenses | 4,311,907 | 4,559,970 | 5,549,501 | 4,824,124 | 5,465,463 | 5,418,438 | 5,776,814 | 6,773,645 | 19,245,502 | 23,434,360 | 26,130,956
Loss before income taxes | (403,360) | (1,428,838) | (1,684,130) | (2,586,855) | (653,065) | (1,072,435) | (612,185) | (3,337,441) | $ (6,103,183) | $ (5,675,126) | $ 1,052,102
Net loss | $ (406,325) | $ (1,433,830) | $ (1,689,181) | $ (2,591,888) | $ (656,582) | $ (1,085,294) | $ (617,425) | $ (3,310,020) |  |  |
Basic and diluted net loss per share (in dollars per share) | $ (0.06) | $ (0.20) | $ (0.23) | $ (0.35) | $ (0.09) | $ (0.15) | $ (0.08) | $ (0.44) | $ (0.83) | $ (0.77) | $ 0.14

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