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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, 2018 USD ($) | Jul. 31, 2018 USD ($) | Apr. 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | Apr. 30, 2017 USD ($) | Jan. 31, 2017 USD ($) | Oct. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Oct. 31, 2016 USD ($)
Revenues, Total | $ 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
Number of Reportable Segments |  |  |  |  |  |  |  |  | 1 |  |
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  | $ 74,778,141 | 51,558,474 | 51,379,528
Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  | 13,050,449 | 12,534,374 | 13,236,473
Customer One [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  | 28,600,000 | $ 10,500,000 | $ 9,700,000
Customer Two [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  | $ 10,100,000 |  |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Number of Customers |  |  |  |  |  |  |  |  | 2 | 1 | 1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer One [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 32.50% | 16.40% | 15.10%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer Two [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 11.50% |  |
Customer Concentration Risk [Member] | Stockholders' Equity, Total [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Number of Customers |  |  |  |  |  |  |  |  | 2 | 1 | 1
Customer Concentration Risk [Member] | Stockholders' Equity, Total [Member] | Customer One [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 14.50% | 8.90% | 8.60%
Customer Concentration Risk [Member] | Stockholders' Equity, Total [Member] | Customer Two [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 11.70% |  |
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 85.00% | 80.00% | 80.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 15.00% | 20.00% | 20.00%

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