CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) [Abstract]
Revenue	$ 19,721,095	$ 16,009,608
Cost of sales	14,756,709	12,159,504
Gross profit	4,964,386	3,850,104
Selling, general and administrative expenses	2,104,881	1,800,422
Income from operations	2,859,505	2,049,682
Interest expense	149,185	37,632
Income before provision for income taxes	2,710,320	2,012,050
Provision for income taxes	791,000	644,000
Net income	1,919,320	1,368,050
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Change in unrealized loss - interest rate swap	(25,278)	7,736
Comprehensive income	$ 1,894,042	$ 1,375,786
Income per common share - basic (in dollars per share)	$ 0.28	$ 0.20
Income per common share - diluted (in dollars per share)	$ 0.27	$ 0.19
Shares used in computing earnings per common share:
Basic (in shares)	6,952,910	6,795,229
Diluted (in shares)	7,228,061	7,193,073