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STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
STATEMENTS OF INCOME AND COMPREHENSIVE INCOME [Abstract]      
Revenue $ 82,988,522 $ 89,272,582 $ 74,135,669
Cost of sales 64,555,275 65,039,969 55,325,729
Gross profit 18,433,247 24,232,613 18,809,940
Selling, general and administrative expenses 6,704,524 7,322,630 7,931,586
Income from operations 11,728,723 16,909,983 10,878,354
Other income (expense):      
Interest/other income 78,957 31,520 4,065
Interest expense (653,786) (416,373) (343,491)
Total other expense, net (574,829) (384,853) (339,426)
Income before provision for income taxes 11,153,894 16,525,130 10,538,928
Provision for income taxes 3,417,000 5,514,000 3,122,000
Net income 7,736,894 11,011,130 7,416,928
Other comprehensive income (loss), net of tax Change in unrealized gain (loss)-      
Interest rate swap 19,712 (19,055) 23,632
Comprehensive income $ 7,756,606 $ 10,992,075 $ 7,440,560
Income per common share-basic (in dollars per share) $ 0.92 $ 1.43 $ 1.08
Income per common share-diluted (in dollars per share) $ 0.91 $ 1.40 $ 1.04
Shares used in computing earnings per common share:      
Basic (in shares) 8,389,048 7,721,304 6,869,624
Diluted (in shares) 8,470,578 7,865,090 7,133,604