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CONSOLIDATED STATEMENTS OF EARNINGS (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
CONSOLIDATED STATEMENTS OF EARNINGS        
Revenue $ 31,487,231 $ 30,383,957 $ 94,691,644 $ 97,429,365
Cost and expenses        
Cost of services 28,286,561 25,010,953 71,519,202 63,559,002
Selling, general and administrative 2,453,946 2,050,325 4,834,487 4,350,327
Depreciation and amortization expense 6,367,015 6,182,912 13,053,384 11,905,511
Total cost and expenses 37,107,522 33,244,190 89,407,073 79,814,840
Income (loss) from operations (5,620,291) (2,860,233) 5,284,571 17,614,525
Interest expense 308,452 280,293 628,158 522,638
Income (loss) before income taxes (5,928,743) (3,140,526) 4,656,413 17,091,887
Income tax expense (benefit) (1,924,714) (1,166,405) 2,308,970 6,681,748
NET INCOME (LOSS) $ (4,004,029) $ (1,974,121) $ 2,347,443 $ 10,410,139
Earnings per common share:        
Basic (in dollars per share) $ (0.18) $ (0.09) $ 0.11 $ 0.49
Diluted (in dollars per share) $ (0.18) $ (0.09) $ 0.11 $ 0.48
Weighted average number of common shares outstanding:        
Basic (in shares) 21,831,665 21,449,378 21,777,561 21,385,418
Diluted (in shares) 21,831,665 21,449,378 22,119,673 21,818,493