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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 6,351,472 $ 12,384,260
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 6,686,369 5,722,599
Gain on disposal of property and equipment (42,485) (279,242)
Non-cash compensation 217,952 89,179
Deferred income taxes (930,840) (91,234)
Changes in operating assets and liabilities    
Trade accounts receivable (2,488,167) (34,847,890)
Cost and estimated earnings in excess of billings on uncompleted contracts (2,210,937) 1,846,409
Prepaid expenses and other 815,489 680,869
Prepaid federal and state income tax   78,268
Other assets (1,115) (3,153)
Trade accounts payable (1,191,337) 3,712,864
Accrued liabilities 443,155 2,160,206
Billings in excess of cost and estimated earnings on uncompleted contracts (2,853,690) 3,386,306
Federal and state income taxes payable 475,328 4,786,372
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES 5,271,194 (374,187)
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (559,335) (2,837,982)
Proceeds from sale of property and equipment 42,982 328,049
NET CASH USED IN INVESTING ACTIVITIES (516,353) (2,509,933)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes payable (2,994,826) (2,095,986)
Principal payments on capital lease obligations (643,768) (406,825)
Proceeds from exercise of stock options 336,764 140,538
NET CASH USED IN FINANCING ACTIVITIES (3,301,830) (2,362,273)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 1,453,011 (5,246,393)
Effect of exchange rates on cash (67,822) 162,573
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 8,614,244 15,745,559
CASH AND CASH EQUIVALENTS AT END OF PERIOD 9,999,433 10,661,739
Supplemental cash flow information    
Interest paid 319,706 242,345
Income taxes paid 4,689,198 3,074,747
Noncash investing and financing activities    
Capital lease obligations incurred 316,850 874,651
Financed equipment purchase   7,701,800
Financed insurance premiums 156,276 156,723
Restricted stock awards to employees 54,390 46,020
Treasury shares issued for stock options exercised $ 183,964 $ 341,533