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REVENUE - Contract assets and contract liabilities (Details) - USD ($)
Mar. 31, 2023
Mar. 31, 2022
REVENUE    
Contract assets $ 8,947,811 $ 8,350,231
Unbilled    
REVENUE    
Contract assets 19,485,914 14,216,187
Progress Payments    
REVENUE    
Contract assets $ (10,538,103) $ (5,865,955)