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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Mar. 31, 2020
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, 2020                                        
Allowance for doubtful accounts receivable and cash discounts (deducted from related asset account)
   $
29,178
     $
—
     $
677,652
     $
624,413
     $
82,417
  
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