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Schedule II - Valuation and Qualifying Accounts (Tables)
12 Months Ended
Sep. 28, 2019
Notes Tables  
Summary of Valuation Allowance [Table Text Block]
    SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS    
                               
       

Opening

   

Charged to

           

Closing

 

Year

 

Description

 

Balance

   

Expense

   

Deductions

   

Balance

 
                                     

2019

 

Allowance for doubtful accounts

  $ 400,000     $ 389,000     $ 217,000   (1)  $ 572,000  
                                     

2018

 

Allowance for doubtful accounts

  $ 359,000     $ 259,000     $ 218,000   (1)  $ 400,000  
                                     

2017

 

Allowance for doubtful accounts

  $ 571,000     $ 122,000     $ 334,000   (1)  $ 359,000