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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, 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%

X

- Definition

Number of customers for a concentration risk benchmark.

+ References

No definition available.

+ Details

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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=84177426&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=77997519&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=84177426&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=77997519&loc=d3e13537-108611

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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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

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