DISAGGREGATION OF REVENUE (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue from contracts	$ 51,171,939	$ 25,285,951	$ 129,223,642	$ 82,901,159
Earned over time
Disaggregation of Revenue [Line Items]
Total revenue from contracts	40,029,106	24,034,728	108,248,744	74,112,651
Earned at point in time
Disaggregation of Revenue [Line Items]
Total revenue from contracts	11,142,833	1,251,223	20,974,898	8,788,508
Lump sum contracts
Disaggregation of Revenue [Line Items]
Total revenue from contracts	13,033,786	6,622,372	32,918,955	26,305,242
Unit price contracts
Disaggregation of Revenue [Line Items]
Total revenue from contracts	29,110,922	13,612,974	71,499,347	40,095,299
Cost plus and T&M contracts
Disaggregation of Revenue [Line Items]
Total revenue from contracts	9,027,231	5,050,605	24,805,340	16,500,618
Gas & Water Distribution
Disaggregation of Revenue [Line Items]
Total revenue from contracts	13,667,005	11,780,986	36,282,234	27,517,763
Gas & Water Distribution | Earned over time
Disaggregation of Revenue [Line Items]
Total revenue from contracts	3,315,407	10,783,990	17,263,257	20,638,965
Gas & Water Distribution | Earned at point in time
Disaggregation of Revenue [Line Items]
Total revenue from contracts	10,351,598	996,996	19,018,977	6,878,798
Gas & Water Distribution | Unit price contracts
Disaggregation of Revenue [Line Items]
Total revenue from contracts	13,667,005	11,645,327	36,282,234	26,961,292
Gas & Water Distribution | Cost plus and T&M contracts
Disaggregation of Revenue [Line Items]
Total revenue from contracts		135,659		556,471
Gas & Petroleum Transmission
Disaggregation of Revenue [Line Items]
Total revenue from contracts	15,443,917	1,967,647	35,217,113	14,343,251
Gas & Petroleum Transmission | Earned over time
Disaggregation of Revenue [Line Items]
Total revenue from contracts	15,443,917	1,967,647	35,217,113	13,134,007
Gas & Petroleum Transmission | Earned at point in time
Disaggregation of Revenue [Line Items]
Total revenue from contracts				1,209,244
Gas & Petroleum Transmission | Unit price contracts
Disaggregation of Revenue [Line Items]
Total revenue from contracts	15,443,917	1,967,647	35,217,113	13,134,007
Gas & Petroleum Transmission | Cost plus and T&M contracts
Disaggregation of Revenue [Line Items]
Total revenue from contracts				1,209,244
Electrical, Mechanical, and General
Disaggregation of Revenue [Line Items]
Total revenue from contracts	22,061,017	11,537,318	57,724,295	41,040,145
Electrical, Mechanical, and General | Earned over time
Disaggregation of Revenue [Line Items]
Total revenue from contracts	21,269,782	11,283,091	55,768,374	40,339,679
Electrical, Mechanical, and General | Earned at point in time
Disaggregation of Revenue [Line Items]
Total revenue from contracts	791,235	254,227	1,955,921	700,466
Electrical, Mechanical, and General | Lump sum contracts
Disaggregation of Revenue [Line Items]
Total revenue from contracts	13,033,786	6,622,372	32,918,955	26,305,242
Electrical, Mechanical, and General | Cost plus and T&M contracts
Disaggregation of Revenue [Line Items]
Total revenue from contracts	$ 9,027,231	$ 4,914,946	$ 24,805,340	$ 14,734,903