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Schedule II - Valuation And Qualifying Accounts (Details) (USD $)
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Allowance for doubtful accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 7,968 $ 8,307 $ 5,603
Net Additions (Reversals) Charged to Expense 419 1,788 4,244
Additions Charged to Other Accounts 0 0 0
Deductions (1,851) (2,127) (1,540)
Balance at End of Period 6,536 7,968 8,307
Allowance for supplier accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 54,393 74,382 74,938
Net Additions (Reversals) Charged to Expense 5,461 1,623 11,929
Additions Charged to Other Accounts 0 0 0
Deductions (13,776) (21,612) (12,485)
Balance at End of Period 46,078 54,393 74,382
Allowance for recoverable taxes [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 26,044 24,719 22,126
Net Additions (Reversals) Charged to Expense 5,607 4,005 2,564
Additions Charged to Other Accounts 0 0 0
Deductions (2,147) (2,680) 29
Balance at End of Period $ 29,504 $ 26,044 $ 24,719