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Note 11 - Revenue Recognition (Tables)
6 Months Ended
Apr. 30, 2021
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
  

Three months ended

  

Six months ended

 
  

April 30,

  

April 30,

 
  

2021

  

2020

  

2021

  

2020

 

United States

 $12,381,735  $11,857,559  $22,085,345  $22,345,906 

Outside the United States

  3,359,379   3,005,869   5,532,342   5,404,918 

Total net sales

 $15,741,114  $14,863,428  $27,617,687  $27,750,824