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REVENUE - contract assets and contract liabilities (Details) - USD ($)
Jun. 30, 2019
Mar. 31, 2019
Contract assets    
Contract with Customer, Asset, Net, Current $ 2,873,611 $ 4,390,832
Unbilled Revenues [Member]    
Contract assets    
Contract with Customer, Asset, Net, Current 8,771,341 9,324,361
Progress Payments Receivable [Member]    
Contract assets    
Contract with Customer, Asset, Net, Current $ (5,897,730) $ (4,933,529)