CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) [Abstract]
Revenue	$ 19,927,433	$ 19,721,095
Cost of sales	15,486,863	14,756,709
Gross profit	4,440,570	4,964,386
Selling, general and administrative expenses	1,877,922	2,104,881
Income from operations	2,562,648	2,859,505
Interest expense	141,372	149,185
Income before provision for income taxes	2,421,276	2,710,320
Provision for income taxes	750,000	791,000
Net income	1,671,276	1,919,320
Other comprehensive income (loss), net of tax - Change in unrealized gain (loss)-
interest rate swap	3,711	(25,278)
Comprehensive income	$ 1,674,987	$ 1,894,042
Income per common share - basic (in dollars per share)	$ 0.20	$ 0.28
Income per common share - diluted (in dollars per share)	$ 0.20	$ 0.27
Shares used in computing income per common share:
Basic (in shares)	8,377,654	6,952,910
Diluted (in shares)	8,447,974	7,228,061