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CONSOLIDATED STATEMENTS OF EARNINGS (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Revenue $ 41,834,680 $ 31,013,392 $ 139,264,045 $ 111,476,221
Cost and expenses        
Cost of services 30,918,343 21,718,157 94,477,345 77,938,081
Selling, general and administrative 2,134,408 2,437,866 6,484,735 7,211,319
Depreciation and amortization expense 6,685,698 4,968,140 18,591,209 14,209,566
Total cost and expenses 39,738,449 29,124,163 119,553,289 99,358,966
Income from operations 2,096,231 1,889,229 19,710,756 12,117,255
Interest expense 350,366 192,495 873,004 575,191
Income before income taxes 1,745,865 1,696,734 18,837,752 11,542,064
Income tax expense 634,223 650,156 7,315,971 4,144,977
NET INCOME $ 1,111,642 $ 1,046,578 $ 11,521,781 $ 7,397,087
Earnings per common share:        
Basic (in dollars per share) $ 0.05 $ 0.05 $ 0.56 $ 0.37
Diluted (in dollars per share) $ 0.05 $ 0.05 $ 0.55 $ 0.36
Weighted average number of common shares outstanding:        
Basic (in shares) 20,566,096 20,211,848 20,433,905 20,194,276
Diluted (in shares) 20,878,977 20,512,761 20,815,181 20,512,061