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Note 7 - Concentrations of Credit Risk (Tables)
3 Months Ended
Jan. 31, 2022
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   

Three Months Ended January 31,

 
   

2022

   

2021

 

Wireless provider

    32 %     *  

Distributor A

     *       16 %

Distributor B

     *       12 %