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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 2,347,443 $ 10,410,139
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 13,053,384 11,905,511
Gain on disposal of property and equipment (397,936) (929,727)
Non-cash compensation 659,249 186,496
Deferred income taxes (1,861,680) (536,452)
Changes in operating assets and liabilities    
Trade accounts receivable 20,369,437 (5,198,515)
Cost and estimated earnings in excess of billings on uncompleted contracts 5,220,391 2,491,264
Prepaid expenses and other 526,865 900,449
Prepaid federal and state income tax   78,268
Other assets (1,112) (9,424)
Trade accounts payable (10,462,324) 4,247,980
Accrued liabilities (2,627,296) (210,238)
Billings in excess of cost and estimated earnings on uncompleted contracts (1,700,430) 8,230,444
Income taxes payable (2,040,792) 2,858,858
NET CASH PROVIDED BY OPERATING ACTIVITIES 23,085,199 34,425,053
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (458,271) (22,376,129)
Proceeds from sale of property and equipment 697,330 1,542,050
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES 239,059 (20,834,079)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes payable (6,293,682) (4,543,954)
Principal payments on capital lease obligations (1,109,478) (899,358)
Proceeds from exercise of stock options 395,571 377,382
Payment of dividends (939) (1,150)
NET CASH USED IN FINANCING ACTIVITIES (7,008,528) (5,067,080)
NET INCREASE IN CASH AND CASH EQUIVALENTS 16,315,730 8,523,894
EFFECT OF EXCHANGE RATES ON CASH (123,155) (10,296)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 8,614,244 15,745,559
CASH AND CASH EQUIVALENTS AT END OF PERIOD 24,806,819 24,259,157
Supplemental cash flow information    
Interest paid 628,158 522,638
Income taxes paid 6,211,443 4,281,074
Noncash investing and financing activities    
Capital lease obligations incurred 368,396 1,798,753
Financed equipment purchase   15,201,800
Financed insurance premiums 3,064,370 2,882,751
Restricted stock awards to employees 25,441 46,020
Treasury shares issued for stock options exercised $ 183,964 $ 433,615