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STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenue	$ 18,191,623	$ 20,032,701
Cost of revenue	14,141,755	15,495,187
Gross profit	4,049,868	4,537,514
Selling, general and administrative expenses	2,049,840	2,163,878
Income from operations	2,000,028	2,373,636
Interest expense	447,263	390,335
Income before provision for income taxes	1,552,765	1,983,301
Provision for income taxes	296,000	734,000
Net income	1,256,765	1,249,301
Other comprehensive loss net of tax - Change in unrealized loss on interest rate swap	(5,800)	5,200
Comprehensive income	$ 1,250,965	$ 1,254,501
Income per common share - basic (in dollars per share)	$ 0.14	$ 0.14
Income per common share - diluted (in dollars per share)	$ 0.14	$ 0.14
Shares used in computing income per common share:
Basic (in shares)	8,888,179	8,781,292
Diluted (in shares)	8,940,385	8,830,953

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