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Note 11 - Revenue Recognition - Revenue Attributed to United States and All Other Countries (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
UNITED STATES                      
Net sales                 44,661,958 58,207,966 74,778,141
Non-US [Member]                      
Net sales                 $ 10,615,442 $ 13,116,480 $ 13,050,449