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CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenue	$ 22,110,829	$ 26,790,881	$ 57,061,826	$ 68,611,766
Cost of sales	17,086,461	21,194,449	58,642,561	55,564,894
Gross profit (loss)	5,024,368	5,596,432	(1,580,735)	13,046,872
Selling, general and administrative expenses	2,014,147	1,898,965	6,603,321	5,968,123
Income (loss) from operations	3,010,221	3,697,467	(8,184,056)	7,078,749
Interest expense	338,156	218,382	937,523	703,436
Income (loss) before provision for (benefit from) income taxes	2,672,065	3,479,085	(9,121,579)	6,375,313
Provision for (benefit from) income taxes	986,000	1,033,000	(3,378,000)	2,011,000
Net income (loss)	1,686,065	2,446,085	(5,743,579)	4,364,313
Other comprehensive income (loss) net of tax - Change in unrealized loss on interest rate swap	25,936	1,382	(44,547)	3,906
Comprehensive income (loss)	$ 1,712,001	$ 2,447,467	$ (5,788,126)	$ 4,368,219
Income (loss) per common share - basic (in dollars per share)	$ 0.19	$ 0.29	$ (0.67)	$ 0.51
Income (loss) per common share - diluted (in dollars per share)	$ 0.19	$ 0.28	$ (0.67)	$ 0.51
Shares used in computing income (loss) per common share:
Basic (shares)	8,678,608	8,564,417	8,628,716	8,544,475
Diluted (shares)	8,692,420	8,625,308	8,628,716	8,613,316

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