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Note 9 - Segment Information and Business and Credit Concentrations (Details Textual)
3 Months Ended 9 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Number of Reportable Segments     1  
Customer Concentration Risk [Member] | Accounts Receivable [Member]        
Concentration Risk, Number of Customers     1  
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]        
Concentration Risk, Percentage     27.80%  
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]        
Concentration Risk, Percentage   15.80% 36.70% 16.30%
Concentration Risk, Number of Customers 2 1 1 1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer One [Member]        
Concentration Risk, Percentage 10.20%      
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer Two [Member]        
Concentration Risk, Percentage 35.50%