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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Mar. 31, 2018
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, 2018                                        
Allowance for doubtful accounts receivable and cash discounts (deducted from related asset account)
   $
27,276
     $
—
     $
425,140
     $
431,364
     $
21,052
  
                                         
Year ended March 31, 2017                                        
Allowance for doubtful accounts receivable and cash discounts (deducted from related asset account)
   $
22,276
     $
—
     $
307,932
     $
302,932
     $
27,276