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STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
STATEMENTS OF INCOME [Abstract]      
Revenue $ 89,272,582 $ 74,135,669 $ 43,990,784
Cost of sales 65,039,969 55,325,729 37,877,960
Gross profit 24,232,613 18,809,940 6,112,824
Selling, general and administrative expenses 7,322,630 7,931,586 5,415,292
Income from operations 16,909,983 10,878,354 697,532
Other income (expense):      
Interest/other income 31,520 4,065 3,770
Interest expense (416,373) (343,491) (158,406)
Total other income (expense), net (384,853) (339,426) (154,636)
Income before provision for income taxes 16,525,130 10,538,928 542,896
Provision for income taxes 5,514,000 3,122,000 13,000
Net income 11,011,130 7,416,928 529,896
Other comprehensive income (loss), net of tax Change in unrealized gain (loss)-      
Interest rate swap (19,055) 23,632 7,470
Comprehensive income $ 10,992,075 $ 7,440,560 $ 537,366
Income per common share-Basic (in dollars per share) $ 1.43 $ 1.08 $ 0.08
Income per common share-Diluted (in dollars per share) $ 1.40 $ 1.04 $ 0.08
Shares used in computing income per common share:      
Basic (in shares) 7,721,304 6,869,624 6,489,942
Diluted (in shares) 7,865,090 7,133,604 6,736,501