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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenue $ 151,028,582 $ 108,318,801 $ 90,431,899
Cost and expenses      
Cost of services 104,022,944 85,932,862 65,379,612
Selling, general and administrative 9,626,679 6,894,500 5,522,939
Depreciation and amortization expense 19,214,069 15,343,804 14,621,237
Total Cost and expenses 132,863,692 108,171,166 85,523,788
Income from operations 18,164,890 147,635 4,908,111
Interest expense 784,425 790,417 1,020,681
Income (loss) before income taxes 17,380,465 (642,782) 3,887,430
Income tax expense (benefit):      
Current 4,077,297 433,350 1,289,938
Deferred 2,469,953 146,550 717,873
Income tax expense 6,547,250 579,900 2,007,811
Net income (loss) $ 10,833,215 $ (1,222,682) $ 1,879,619
Net income (loss) per common share:      
Basic (in dollars per share) $ 0.56 $ (0.06) $ 0.10
Diluted (in dollars per share) $ 0.55 $ (0.06) $ 0.10
Weighted average number of shares outstanding:      
Basic (in shares) 19,243,356 19,202,804 19,194,334
Diluted (in shares) 19,545,035 19,202,804 19,261,243