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Note 10 - Business and Credit Concentrations, Major Customers and Geographic Information (Details Textual)	3 Months Ended								12 Months Ended
	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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Number of customers for a concentration risk benchmark.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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