Business Segment, Business Credit Risks and Concentration -Business Segments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total revenue	$ 180,645,718	$ 138,148,842
Total operating expenses	169,430,167	130,585,138
Total operating income	11,215,551	7,563,704
Total other expenses, net	(1,225,571)	(739,007)
Income before income taxes	9,989,980	6,824,697
Capital Expenditures	19,854,468	19,609,245
Depreciation and Amortization	10,846,334	8,436,972
Operating Segments | Electrical construction
Segment Reporting Information [Line Items]
Total revenue	167,779,823	136,526,511
Total operating expenses	152,660,559	123,914,953
Total operating income	15,119,264	12,611,558
Total other expenses, net	(1,362,917)	(761,117)
Income before income taxes	13,756,347	11,850,441
Capital Expenditures	18,799,010	19,514,124
Depreciation and Amortization	10,718,202	8,319,362
Operating Segments | Real estate development
Segment Reporting Information [Line Items]
Total revenue	12,865,895	1,622,331
Total operating expenses	11,106,477	1,924,835
Total operating income	1,759,418	(302,504)
Total other expenses, net	(5,498)	(56,010)
Income before income taxes	1,753,920	(358,514)
Capital Expenditures	116,497	42,545
Depreciation and Amortization	26,950	21,279
Corporate
Segment Reporting Information [Line Items]
Total operating expenses	5,663,131	4,745,350
Total operating income	(5,663,131)	(4,745,350)
Total other expenses, net	142,844	78,120
Income before income taxes	(5,520,287)	(4,667,230)
Capital Expenditures	938,961	52,576
Depreciation and Amortization	$ 101,182	$ 96,331