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CONSOLIDATED STATEMENTS OF EARNINGS (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenue $ 30,383,957 $ 30,215,516 $ 97,429,365 $ 80,462,829
Cost and expenses        
Cost of services 25,010,953 21,950,230 63,559,002 56,219,924
Selling, general and administrative 2,050,325 2,272,895 4,350,327 4,773,453
Depreciation and amortization expense 6,182,912 4,778,547 11,905,511 9,241,426
Total cost and expenses 33,244,190 29,001,672 79,814,840 70,234,803
Income (loss) from operations (2,860,233) 1,213,844 17,614,525 10,228,026
Interest expense 280,293 191,856 522,638 382,696
Income (loss) before income taxes (3,140,526) 1,021,988 17,091,887 9,845,330
Income tax expense (benefit) (1,166,405) 435,213 6,681,748 3,494,821
NET INCOME (LOSS) $ (1,974,121) $ 586,775 $ 10,410,139 $ 6,350,509
Earnings per common share:        
Basic (in dollars per share) $ (0.10) $ 0.03 $ 0.51 $ 0.31
Diluted (in dollars per share) $ (0.10) $ 0.03 $ 0.50 $ 0.31
Weighted average number of common shares outstanding:        
Basic (in shares) 20,427,979 20,200,978 20,367,065 20,185,345
Diluted (in shares) 20,427,979 20,544,494 20,779,517 20,511,822