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Schedule II - Valuation And Qualifying Accounts (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Allowance for doubtful accounts [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 2,985 | $ 1,783 | $ 3,947
Net Additions (Reversals) Charged to Expense | (128) | 1,358 | (2,006)
Additions Charged to Other Accounts | 0 | 0 | 0
Deductions | (463) | (156) | (158)
Balance at End of Period | 2,394 | 2,985 | 1,783
Allowance for supplier accounts [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 18,105 | 21,720 | 27,074
Net Additions (Reversals) Charged to Expense | 937 | (2,339) | 3,730
Additions Charged to Other Accounts | 0 | 0 | 0
Deductions | (2,614) | (1,276) | (9,084)
Balance at End of Period | 16,428 | 18,105 | 21,720
Allowance for recoverable taxes [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 17,181 | 14,679 | 12,552
Net Additions (Reversals) Charged to Expense | (2,586) | 3,535 | 1,732
Additions Charged to Other Accounts | 0 | 0 | 0
Deductions | 4,183 | (1,033) | 395
Balance at End of Period | $ 18,778 | $ 17,181 | $ 14,679

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