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CONSOLIDATED STATEMENTS OF EARNINGS (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Revenue $ 67,045,408 $ 50,247,313
Cost and expenses:    
Cost of services 38,548,049 34,269,694
Selling, general and administrative 2,300,002 2,500,558
Depreciation and amortization expense 5,722,599 4,462,879
Total Cost and expenses 46,570,650 41,233,131
Income from operations 20,474,758 9,014,182
Interest expense 242,345 190,840
Income before income taxes 20,232,413 8,823,342
Income tax expense 7,848,153 3,059,608
NET INCOME $ 12,384,260 $ 5,763,734
Earnings per common share:    
Basic (in dollars per share) $ 0.61 $ 0.29
Diluted (in dollars per share) $ 0.60 $ 0.28
Weighted average number of shares outstanding:    
Basic (in shares) 20,311,392 20,169,538
Diluted (in shares) 20,751,640 20,473,710