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Schedule II - Valuation And Qualifying Accounts (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Allowance for doubtful accounts [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 1,783 | $ 3,947 | $ 9,099
Net Additions (Reversals) Charged to Expense | 1,358 | (2,006) | (5,071)
Additions Charged to Other Accounts | 0 | 0 | 0
Deductions | (156) | (158) | (81)
Balance at End of Period | 2,985 | 1,783 | 3,947
Allowance for supplier accounts [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 21,720 | 27,074 | 28,865
Net Additions (Reversals) Charged to Expense | (2,339) | 3,730 | (857)
Additions Charged to Other Accounts | 0 | 0 | 0
Deductions | (1,276) | (9,084) | (934)
Balance at End of Period | 18,105 | 21,720 | 27,074
Allowance for recoverable taxes [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 14,679 | 12,552 | 18,752
Net Additions (Reversals) Charged to Expense | 3,535 | 1,732 | (3,392)
Additions Charged to Other Accounts | 0 | 0 | 0
Deductions | (1,033) | 395 | (2,808)
Balance at End of Period | $ 17,181 | $ 14,679 | $ 12,552

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