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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 10,410,139 $ 6,350,509
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 11,905,511 9,241,426
(Gain) loss on disposal of property and equipment (929,727) (64,324)
Non-cash compensation 186,496 226,845
Cash paid in lieu of stock options   (165,000)
Deferred income taxes (536,452) 120,846
Changes in operating assets and liabilities    
Trade accounts receivable (5,198,515) 4,692,212
Cost and estimated earnings in excess of billings on uncompleted contracts 2,491,264 2,489,520
Prepaid expenses and other 900,449 1,366,962
Prepaid federal and state income tax 78,268 1,232,568
Other assets (9,424) (1,841)
Trade accounts payable 4,247,980 (3,486,326)
Accrued liabilities (210,238) 732,220
Billings in excess of cost and estimated earnings on uncompleted contracts 8,230,444 400,418
Income taxes payable 2,858,858 1,237,902
NET CASH PROVIDED BY OPERATING ACTIVITIES 34,425,053 24,373,937
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (22,376,129) (11,067,278)
Proceeds from sale of property and equipment 1,542,050 168,161
NET CASH USED IN INVESTING ACTIVITIES (20,834,079) (10,899,117)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes payable (4,543,954) (4,117,298)
Principal payments on capital lease obligations (899,358) (620,699)
Proceeds from exercise of stock options 377,382 108,688
Payment of dividends (1,150)  
NET CASH USED IN FINANCING ACTIVITIES (5,067,080) (4,629,309)
NET INCREASE IN CASH AND CASH EQUIVALENTS 8,523,894 8,845,511
EFFECT OF EXCHANGE RATES ON CASH (10,296) 11,867
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 15,745,559 13,072,503
CASH AND CASH EQUIVALENTS AT END OF PERIOD 24,259,157 21,929,881
Supplemental cash flow information    
Interest paid 522,638 382,696
Income taxes paid 4,281,074 903,503
Noncash investing and financing activities    
Capital lease obligations incurred 1,798,753 1,002,699
Financed equipment purchase 15,201,800  
Financed insurance premiums 2,882,751 2,162,868
Restricted stock awards to employees 46,020  
Treasury shares issued for stock options exercised $ 433,615