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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Mar. 31, 2019
Notes Tables  
Summary of Valuation Allowance [Table Text Block]
Column A
  
Column B
    
Column C
    
Column D
    
Column E
  
   
 
 
 
  
Additions
    
 
 
 
  
 
 
 
Description
  
Balance at
Beginning
of Period
    
Charged to
Costs and
Expenses
    
Charged to
Other Accounts —
Describe(A)
    
Deductions —
Describe(B)
    
Balance at
End of Period
  
Year ended March 31, 2019
Allowance for doubtful accounts receivable and cash discounts (deducted from related asset account)
   $
21,052
     $
—
     $
765,732
     $
757,606
     $
29,178
  
Year ended March 31, 2018
Allowance for doubtful accounts receivable and cash discounts (deducted from related asset account)
   $
27,276
     $
—
     $
425,140
     $
431,364
     $
21,052