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Consolidated Statement of Cash Flows (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 11,521,781 $ 7,397,087
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 18,591,209 14,209,566
(Gain) loss on disposal of property and equipment (1,060,986) (126,522)
Non-cash compensation 380,955 168,652
Deferred income taxes (1,113,099) 1,011,034
Changes in operating assets and liabilities    
Trade accounts receivable (8,119,120) (701,599)
Cost and estimated earnings in excess of billings on uncompleted contracts 3,005,148 2,586,403
Prepaid expenses and other 1,544,548 1,942,411
Prepaid federal and state income tax 78,268 1,042,770
Other assets (10,246) (13,707)
Trade accounts payable 3,062,383 (1,406,656)
Accrued liabilities 1,669,776 2,015,569
Billings in excess of cost and estimated earnings on uncompleted contracts 4,310,422 298,292
Income taxes payable 2,704,357 1,544,449
NET CASH PROVIDED BY OPERATING ACTIVITIES 36,565,396 29,967,749
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (23,673,444) (14,144,555)
Proceeds from sale of property and equipment 1,695,986 233,012
NET CASH USED IN INVESTING ACTIVITIES (21,977,458) (13,911,543)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes payable (7,875,848) (6,488,083)
Principal payments on capital lease obligations (1,458,415) (979,982)
Proceeds from exercise of stock options 377,382 164,356
Payment of dividends (1,150)  
NET CASH USED IN FINANCING ACTIVITIES (8,958,031) (7,303,709)
NET INCREASE IN CASH AND CASH EQUIVALENTS 5,629,907 8,752,497
EFFECT OF EXCHANGE RATES ON CASH 105,975 (86,429)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 15,745,559 13,072,503
CASH AND CASH EQUIVALENTS AT END OF PERIOD 21,481,441 21,738,571
Supplemental cash flow information    
Interest paid 873,004 575,191
Income taxes paid 5,646,445 545,432
Noncash investing and financing activities    
Capital lease obligations incurred 2,129,880 1,419,412
Financed equipment purchase 15,201,800 6,765,619
Financed insurance premiums 2,882,751 2,162,868
Restricted stock awards to employees 1,334,014  
Treasury shares issued for stock options exercised $ 433,615