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CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) [Abstract]        
Revenue $ 20,854,627 $ 17,426,223 $ 40,575,722 $ 33,435,831
Cost of sales 15,085,983 13,181,422 29,842,692 25,340,926
Gross profit 5,768,644 4,244,801 10,733,030 8,094,905
Selling, general and administrative expenses 1,570,231 2,082,464 3,675,112 3,882,887
Income from operations 4,198,413 2,162,337 7,057,918 4,212,018
Interest expense 174,394 67,521 323,580 105,153
Income before provision for income taxes 4,024,019 2,094,816 6,734,338 4,106,865
Provision for income taxes 1,328,000 524,000 2,119,000 1,168,000
Net income 2,696,019 1,570,816 4,615,338 2,938,865
Other comprehensive income (loss), net of tax        
Change in unrealized gain (loss)- interest rate swap (7,058) 3,552 (32,336) 11,268
Comprehensive income $ 2,688,961 $ 1,574,368 $ 4,583,002 $ 2,950,133
Income per common share - basic (in dollars per share) $ 0.37 $ 0.23 $ 0.65 $ 0.43
Income per common share - diluted (in dollars per share) $ 0.36 $ 0.22 $ 0.63 $ 0.41
Shares used in computing income per common share:        
Basic (in shares) 7,222,554 6,847,357 7,087,732 6,821,437
Diluted (in shares) 7,414,273 7,148,591 7,280,294 7,124,603