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Schedule II - Valuation And Qualifying Accounts (Details) - USD ($)
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Allowance for doubtful accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 5,482 $ 6,536 $ 7,968
Net Additions (Reversals) Charged to Expense 6,970 1,341 419
Additions Charged to Other Accounts 0 0 0
Deductions (3,353) (2,395) (1,851)
Balance at End of Period 9,099 5,482 6,536
Allowance for supplier accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 34,673 46,078 54,393
Net Additions (Reversals) Charged to Expense 815 3,734 5,461
Additions Charged to Other Accounts 0 0 0
Deductions (6,623) (15,139) (13,776)
Balance at End of Period 28,865 34,673 46,078
Allowance for recoverable taxes [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 23,218 29,504 26,044
Net Additions (Reversals) Charged to Expense 1,755 1,855 5,607
Additions Charged to Other Accounts 0 0 0
Deductions (6,221) (8,141) (2,147)
Balance at End of Period $ 18,752 $ 23,218 $ 29,504