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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, 2017 USD ($) | Jul. 31, 2017 USD ($) | Apr. 30, 2017 USD ($) | Jan. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) | Apr. 30, 2016 USD ($) | Jan. 31, 2016 USD ($) | Oct. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Oct. 31, 2015 USD ($)
Revenue, Net | $ 17,206,880 | $ 16,432,243 | $ 15,847,473 | $ 14,606,252 | $ 17,312,823 | $ 16,915,135 | $ 16,340,153 | $ 14,047,890 | $ 64,092,848 | $ 64,616,001 | $ 73,568,738
Number of Reportable Segments |  |  |  |  |  |  |  |  | 1 |  |
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  |  |  |  |  |  |  |  | $ 51,558,474 | 51,379,528 | 57,402,020
Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  |  |  |  |  |  |  |  | 12,534,374 | 13,236,473 | 16,166,718
Customer One [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  |  |  |  |  |  |  |  | $ 10,500,000 | $ 9,700,000 | 10,000,000
Customer Two [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  |  |  |  |  |  |  |  |  |  | $ 8,000,000
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Number of Customers |  |  |  |  |  |  |  |  | 1 | 1 | 2
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer One [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 16.40% | 15.10% | 13.60%
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 |  |  |  |  |  |  |  |  | 8.90% | 8.60% |
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 80.00% | 80.00% | 78.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 20.00% | 20.00% | 22.00%

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