REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total revenues and other income	$ 15,542,678	$ 16,765,385
Relative percentage	100.00%	100.00%
CEA
Disaggregation of Revenue [Line Items]
Total revenues and other income	$ 4,408,958	$ 5,049,330
Relative percentage	28.00%	30.00%
Commercial
Disaggregation of Revenue [Line Items]
Total revenues and other income	$ 11,133,720	$ 11,716,055
Relative percentage	72.00%	70.00%
Equipment systems
Disaggregation of Revenue [Line Items]
Total revenues and other income	$ 2,508,287	$ 2,911,823
Relative percentage	16.00%	17.00%
Equipment systems | CEA
Disaggregation of Revenue [Line Items]
Total revenues and other income	$ 2,508,287	$ 2,911,823
Equipment systems | Commercial
Disaggregation of Revenue [Line Items]
Total revenues and other income	0	0
Services
Disaggregation of Revenue [Line Items]
Total revenues and other income	$ 3,133,793	$ 3,470,653
Relative percentage	20.00%	21.00%
Services | CEA
Disaggregation of Revenue [Line Items]
Total revenues and other income	$ 867,907	$ 1,577,026
Services | Commercial
Disaggregation of Revenue [Line Items]
Total revenues and other income	2,265,886	1,893,627
Construction design-build
Disaggregation of Revenue [Line Items]
Total revenues and other income	$ 9,825,457	$ 10,205,952
Relative percentage	63.00%	61.00%
Construction design-build | CEA
Disaggregation of Revenue [Line Items]
Total revenues and other income	$ 957,623	$ 383,524
Construction design-build | Commercial
Disaggregation of Revenue [Line Items]
Total revenues and other income	8,867,834	9,822,428
Other
Disaggregation of Revenue [Line Items]
Total revenues and other income	$ 75,141	$ 176,957
Relative percentage	0.00%	1.00%
Other | CEA
Disaggregation of Revenue [Line Items]
Total revenues and other income	$ 75,141	$ 176,957
Other | Commercial
Disaggregation of Revenue [Line Items]
Total revenues and other income	$ 0	$ 0