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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities      
Net income (loss) $ 15,671,879 $ 10,833,215 $ (1,222,682)
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 25,502,597 19,214,069 15,343,804
Gain on disposal of property and equipment (1,069,766) (441,524) (39,725)
Stock-based compensation 601,059 483,769 508,254
Deferred income taxes 359,535 2,469,953 146,550
Changes in operating assets and liabilities      
Trade accounts receivable (16,021,574) (2,442,223) (7,377,921)
Cost and estimated earnings in excess of billings on uncompleted contracts (1,121,420) (589,429) (4,098,234)
Prepaid expenses and other 2,820,516 2,326,499 1,384,007
Prepaid federal and state income tax 78,268 1,145,437 (239,844)
Other assets (17,991) (18,035) (27,495)
Trade accounts payable 4,328,707 2,763,004 1,944,647
Accrued liabilities 2,911,755 823,278 443,628
Billings in excess of cost and estimated earnings on uncompleted contracts 2,814,863 (4,550,293) (1,604,706)
Federal and state income tax payable 2,424,634 2,156,447  
Net cash provided by operating activities 39,283,062 34,174,167 5,160,283
Cash flows from investing activities      
Capital expenditures (31,970,418) (22,011,503) (8,220,293)
Proceeds from sale of property and equipment 1,704,722 740,658 164,323
Net cash used in investing activities (30,265,696) (21,270,845) (8,055,970)
Cash flows from financing activities      
Principal payments on notes payable (11,338,097) (9,006,101) (8,448,138)
Principal payments on capital lease obligations (2,081,176) (1,348,164) (1,101,242)
Proceeds from exercise of stock options 377,381 181,505  
Purchase of treasury shares   (71)  
Payment of dividends (3,099,014)   (431)
Net cash used in financing activities (16,140,906) (10,172,831) (9,549,811)
Net increase (decrease) in cash and cash equivalents (7,123,540) 2,730,491 (12,445,498)
Effect of exchange rates on cash (7,775) (57,435) 13,852
Cash and cash equivalents at beginning of year 15,745,559 13,072,503 25,504,149
Cash and cash equivalents at end of year 8,614,244 15,745,559 13,072,503
Supplemental cash flow information      
Interest paid 1,222,454 784,425 790,417
Income taxes paid 7,022,640 774,136 1,479,446
Noncash investing and financing activities      
Capital lease obligations incurred 2,935,514 1,953,263 2,030,175
Financed equipment purchase 22,201,800 6,765,619 4,975,110
Financed insurance premiums 3,050,024 2,336,121 2,206,655
Restricted stock awards to employees, net of cancellations 1,334,014 101,475 20,750
Stock awards to employees   225,000  
Treasury shares issued for stock options exercised $ 433,615