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REVENUE - Contract Assets and Contract Liabilities (Details) - USD ($) | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | ---
Contract assets | $ 5,532,408 | $ 4,504,621
Unbilled |  |
Contract assets | 11,392,948 | 10,635,588
Progress payments |  |
Contract assets | $ (5,860,540) | $ (6,130,967)

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