CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue	$ 23,158,251	$ 20,261,239	$ 48,741,782	$ 38,452,862
Cost of revenue	18,202,069	15,676,421	38,369,790	29,818,176
Gross profit	4,956,182	4,584,818	10,371,992	8,634,686
Selling, general and administrative expenses	2,709,313	2,557,759	5,515,756	4,607,599
Income from operations	2,246,869	2,027,059	4,856,236	4,027,087
Interest expense	575,412	416,834	1,086,181	864,097
Income before provision for (benefit from) income taxes	1,671,457	1,610,225	3,770,055	3,162,990
Provision for (benefit from) income taxes	(1,039,000)	353,000	(599,000)	649,000
Net income	2,710,457	1,257,225	4,369,055	2,513,990
Other comprehensive income net of tax- Change in unrealized loss on interest rate swap		20,600		14,800
Comprehensive income	$ 2,710,457	$ 1,277,825	$ 4,369,055	$ 2,528,790
Income per common share - basic (in dollars per share)	$ 0.23	$ 0.14	$ 0.37	$ 0.28
Income per common share - diluted (in dollars per share)	$ 0.23	$ 0.14	$ 0.37	$ 0.28
Shares used in computing income per common share:
Basic (in shares)	11,607,415	8,938,331	11,710,357	8,913,394
Diluted (in shares)	11,644,768	8,980,155	11,747,711	8,953,321