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Note 4 - Contract Receivables, Contract Assets and Contract Liabilities (Tables)
3 Months Ended
Feb. 29, 2020
Notes Tables  
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
   
February 29, 2020
   
November 30, 2019
 
Receivables
  $
998,000
    $
115,000
 
Assets
   
513,000
     
727,000
 
Liabilities
  $
519,000
    $
89,000