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UNCOMPLETED CONTRACTS - Summary of costs, estimated earnings, and billings on uncompleted contracts (Details) - USD ($)
Dec. 31, 2018
Sep. 30, 2018
Contractors [Abstract]    
Costs incurred on contracts in progress $ 134,224,608 $ 154,793,209
Estimated earnings, net of estimated losses 16,630,258 11,687,859
Costs of uncompleted contracts including net estimated earnings 150,854,866 166,481,068
Less billings to date 141,880,503 164,388,894
Unbilled contracts receivable 8,974,363 2,092,174
Contract assets 10,531,124 5,353,375
Less contract liabilities 1,556,761 3,261,201
Unbilled contracts receivable $ 8,974,363 $ 2,092,174