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Note 8 - Accrued Expenses (Tables)
12 Months Ended
Nov. 30, 2018
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
   
November 30, 2018
   
November 30, 2017
 
Salaries, wages, and commissions
  $
448,737
    $
584,768
 
Accrued warranty expense
   
96,786
     
68,451
 
Other
   
347,761
     
328,339
 
    $
893,284
    $
981,558