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Note 8 - Concentrations of Credit Risk (Tables)
6 Months Ended
Apr. 30, 2022
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  

Three Months Ended April 30,

  

Six Months Ended April 30,

 
  

2022

  

2021

  

2022

  

2021

 

Wireless provider

  24%   *   28%   * 

Distributor A

  *   12%   *   14%

Distributor B

  *   11%   *   11%