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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
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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

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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