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CONSOLIDATED STATEMENTS OF EARNINGS (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CONSOLIDATED STATEMENTS OF EARNINGS      
Revenue $ 196,317,215 $ 151,028,582 $ 108,318,801
Cost and expenses      
Cost of services 135,279,937 104,022,944 85,932,862
Selling, general and administrative 8,755,270 9,626,679 6,894,500
Depreciation and amortization expense 25,502,597 19,214,069 15,343,804
Total cost and expenses 169,537,804 132,863,692 108,171,166
Income from operations 26,779,411 18,164,890 147,635
Interest expense 1,222,454 784,425 790,417
Income (loss) before income taxes 25,556,957 17,380,465 (642,782)
Income tax expense:      
Current 9,525,543 4,077,297 433,350
Deferred 359,535 2,469,953 146,550
Income tax expense 9,885,078 6,547,250 579,900
Net income (loss) $ 15,671,879 $ 10,833,215 $ (1,222,682)
Net income (loss) per common share:      
Basic (in dollars per share) $ 0.76 $ 0.54 $ (0.06)
Diluted (in dollars per share) $ 0.75 $ 0.53 $ (0.06)
Weighted average number of shares outstanding:      
Basic (in shares) 20,489,179 20,205,524 20,162,944
Diluted (in shares) 20,855,596 20,522,587 20,162,944