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Note 10 - Business and Credit Concentrations, Major Customers and Geographic Information (Details Textual) | 3 Months Ended | 12 Months Ended
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Oct. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) | Apr. 30, 2016 USD ($) | Jan. 31, 2016 USD ($) | Oct. 31, 2015 USD ($) | Jul. 31, 2015 USD ($) | Apr. 30, 2015 USD ($) | Jan. 31, 2015 USD ($) | Oct. 31, 2016 USD ($) | Oct. 31, 2015 USD ($) | Oct. 31, 2014 USD ($)
Revenue, Net | $ 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 |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  |  |  |  |  |  |  |  | 51,379,528 | 57,402,020 | 65,457,787
Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  |  |  |  |  |  |  |  | 13,236,473 | 16,166,718 | 17,519,945
Customer One [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  |  |  |  |  |  |  |  | $ 9,700,000 | 10,000,000 | $ 14,000,000
Customer Two [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  |  |  |  |  |  |  |  |  | $ 8,000,000 |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  |  |  |  |  | 1 | 2 | 1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer One [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 15.10% | 13.60% | 16.80%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer Two [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  | 10.80% |
Customer Concentration Risk [Member] | Stockholders' Equity, Total [Member] | Customer One [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 8.60% |  |
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 80.00% | 78.00% | 79.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 20.00% | 22.00% | 21.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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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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