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Note 10 - Revenue Recognition (Tables)
3 Months Ended
Jan. 31, 2019
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
   
Three months ended
 
   
January 31,
 
   
2019
   
2018
 
United States
  $
13,574,401
    $
13,855,308
 
Outside the United States
   
3,176,267
     
3,695,732
 
Total net sales
  $
16,750,668
    $
17,551,040