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Note 10 - Business and Credit Concentrations, Major Customers and Geographic Information - Revenue Attributed to United States and All Other Countries (Details) - USD ($)
3 Months Ended 12 Months Ended
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Net sales $ 20,273,277 $ 23,116,584 $ 26,887,689 $ 17,551,040 $ 17,206,880 $ 16,432,243 $ 15,847,473 $ 14,606,252 $ 87,828,590 $ 64,092,848 $ 64,616,001
UNITED STATES                      
Net sales                 74,778,141 51,558,474 51,379,528
Non-US [Member]                      
Net sales                 $ 13,050,449 $ 12,534,374 $ 13,236,473