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Schedule II - Valuation and Qualifying Accounts (Tables)
12 Months Ended
Sep. 30, 2017
Notes Tables  
Summary of Valuation Allowance [Table Text Block]
     
Opening
   
Charged to
   
 
 
 
 
Closing
 
Year
Description
 
Balance
   
Expense
   
Deductions
   
Balance
 
                                   
                                   
2017
Allowance for doubtful accounts
  $
571,000
    $
122,000
    $
334,000
 (1)
  $
359,000
 
                                   
2016
Allowance for doubtful accounts
  $
304,000
    $
525,000
    $
258,000
 (1)
  $
571,000
 
                                   
2015
Allowance for doubtful accounts
  $
450,000
    $
310,000
    $
456,000
 (1)
  $
304,000