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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income (loss) $ (1,604,244) $ 11,521,781
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 19,110,476 18,591,209
Gain on disposal of property and equipment (635,265) (1,060,986)
Non-cash compensation 817,391 380,955
Deferred income taxes (2,792,520) (1,113,099)
Changes in operating assets and liabilities    
Trade accounts receivable 23,374,057 (8,119,120)
Cost and estimated earnings in excess of billings on uncompleted contracts 3,046,174 3,005,148
Prepaid expenses and other 2,105,774 1,544,548
Prepaid federal and state income tax (1,673,101) 78,268
Other assets 1,769 (10,246)
Trade accounts payable (9,374,217) 3,062,383
Accrued liabilities (2,184,320) 1,669,776
Billings in excess of cost and estimated earnings on uncompleted contracts (2,741,145) 4,310,422
Income taxes payable (3,543,613) 2,704,357
NET CASH PROVIDED BY OPERATING ACTIVITIES 23,907,216 36,565,396
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (1,250,550) (23,673,444)
Proceeds from sale of property and equipment 1,090,607 1,695,986
NET CASH USED IN INVESTING ACTIVITIES (159,943) (21,977,458)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes payable (9,929,954) (7,875,848)
Principal payments on capital lease obligations (1,586,423) (1,458,415)
Proceeds from exercise of stock options 395,551 377,382
Payment of dividends (939) (1,150)
NET CASH USED IN FINANCING ACTIVITIES (11,121,765) (8,958,031)
NET INCREASE IN CASH AND CASH EQUIVALENTS 12,625,508 5,629,907
EFFECT OF EXCHANGE RATES ON CASH 96,048 105,975
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 8,614,244 15,745,559
CASH AND CASH EQUIVALENTS AT END OF PERIOD 21,335,800 21,481,441
Supplemental cash flow information    
Interest paid 903,667 873,004
Income taxes paid 8,167,772 5,646,445
Noncash investing and financing activities    
Capital lease obligations incurred 368,396 2,129,880
Financed equipment purchase   15,201,800
Financed insurance premiums 3,064,370 2,882,751
Restricted stock awards to employees 25,441 1,334,014
Treasury shares issued for stock options exercised $ 484,866 $ 433,615