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Note 10 - Business and Credit Concentrations, Major Customers and Geographic Information (Details Textual) $ in Millions	12 Months Ended
	Oct. 31, 2020 USD ($)	Oct. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)
Customer One [Member]
Revenues, Total	$ 7.9	$ 10.6	$ 28.6
Customer Two [Member]
Revenues, Total		$ 8.7	$ 10.1
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Number of Customers	1	2	2
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer One [Member]
Concentration Risk, Percentage	14.30%	14.90%	32.50%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Two [Member]
Concentration Risk, Percentage		12.20%	11.50%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risk, Number of Customers		2	2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member]
Concentration Risk, Percentage	10.20%	9.60%	14.50%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member]
Concentration Risk, Percentage	5.10%	5.70%	11.70%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES
Concentration Risk, Percentage	81.00%	82.00%	85.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | Non-US [Member]
Concentration Risk, Percentage	19.00%	18.00%	15.00%

X

- Definition

Number of customers for a concentration risk benchmark.

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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.

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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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