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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, 2021
Jul. 31, 2021
Apr. 30, 2021
Jan. 31, 2021
Oct. 31, 2020
Jul. 31, 2020
Apr. 30, 2020
Jan. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Net sales $ 15,883,847 $ 15,634,760 $ 15,741,114 $ 11,876,573 $ 13,887,407 $ 13,639,169 $ 14,863,428 $ 12,887,396 $ 59,136,294 $ 55,277,400 $ 71,324,446
UNITED STATES                      
Net sales                 48,537,091 44,661,958 58,207,966
Non-US [Member]                      
Net sales                 $ 10,599,203 $ 10,615,442 $ 13,116,480