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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
CONSOLIDATED STATEMENTS OF EARNINGS        
Revenue $ 18,236,767 $ 31,487,231 $ 67,038,190 $ 94,691,644
Cost and expenses        
Cost of services 17,656,710 28,286,561 51,570,608 71,519,202
Selling, general and administrative expense 2,157,893 2,453,946 4,772,558 4,834,487
Depreciation and amortization expense 4,856,051 6,367,015 9,931,433 13,053,384
Total cost and expenses 24,670,654 37,107,522 66,274,599 89,407,073
Income from operations (6,433,887) (5,620,291) 763,591 5,284,571
Interest expense 175,954 308,452 357,526 628,158
Income before income taxes (6,609,841) (5,928,743) 406,065 4,656,413
Income tax expense (2,577,838) (1,924,714) 158,365 2,308,970
NET INCOME (LOSS) $ (4,032,003) $ (4,004,029) $ 247,700 $ 2,347,443
Earnings (loss) per common share:        
Basic (in dollars per share) $ (0.18) $ (0.18) $ 0.01 $ 0.11
Diluted (in dollars per share) $ (0.18) $ (0.18) $ 0.01 $ 0.11
Weighted average number of shares outstanding:        
Basic (in shares) 21,957,167 21,831,665 21,956,620 21,777,561
Diluted (in shares) 21,957,167 21,831,665 22,022,615 22,119,673