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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, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2015
Jan. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Net sales $ 17,312,823 $ 16,915,135 $ 16,340,153 $ 14,047,890 $ 16,752,447 $ 20,781,340 $ 18,676,107 $ 17,358,844 $ 64,616,001 $ 73,568,738 $ 82,977,732
UNITED STATES                      
Net sales                 51,379,528 57,402,020 65,457,787
Non-US [Member]                      
Net sales                 $ 13,236,473 $ 16,166,718 $ 17,519,945