Consolidated Statements of Income - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue
Total revenue	$ 44,380,219	$ 37,507,244	$ 91,860,475	$ 71,945,940
Costs and expenses
Selling, general and administrative	2,342,561	2,112,110	4,870,883	4,228,523
Depreciation and amortization	2,738,483	2,002,233	5,319,562	3,889,742
Gain on sale of property and equipment	(6,216)	(51,826)	(32,067)	(65,217)
Total costs and expenses	42,730,648	34,142,882	87,295,864	65,130,030
Total operating income	1,649,571	3,364,362	4,564,611	6,815,910
Other income (expense), net
Interest income	31,218	10,053	42,770	16,841
Interest expense, net of amount capitalized	(411,562)	(207,684)	(763,553)	(397,300)
Other income, net	32,252	22,274	64,536	37,367
Total other expense, net	(348,092)	(175,357)	(656,247)	(343,092)
Income before income taxes	1,301,479	3,189,005	3,908,364	6,472,818
Income tax provision	482,357	1,037,512	1,309,621	1,915,651
Net income	$ 819,122	$ 2,151,493	$ 2,598,743	$ 4,557,167
Net income per share of common stock — basic and diluted	$ 0.03	$ 0.08	$ 0.11	$ 0.18
Weighted average shares outstanding - basic and diluted (shares)	24,522,534	25,451,354	24,524,339	25,451,354
Electrical construction
Revenue
Total revenue	$ 39,204,368	$ 36,195,767	$ 80,591,687	$ 70,327,686
Costs and expenses
Cost of goods and service sold	33,516,400	29,287,017	68,808,411	56,069,877
Real estate development
Revenue
Total revenue	5,175,851	1,311,477	11,268,788	1,618,254
Costs and expenses
Cost of goods and service sold	$ 4,139,420	$ 793,348	$ 8,329,075	$ 1,007,105