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Note 8 - Concentrations of Credit Risk (Tables)
9 Months Ended
Jul. 31, 2021
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  

Three Months Ended July 31,

  

Nine Months Ended July 31,

 
  

2021

  

2020

  

2021

  

2020

 

Wireless provider

  21%  *   11%  * 

Distributor A

  10%  18%  12%  15%

Distributor B

  10%  13%  11%  12%