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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 4,279,703 $ 6,351,472
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,075,382 6,686,369
Gain on disposal of property and equipment (35,867) (42,485)
Non-cash compensation 238,280 217,952
Deferred income taxes (572,361) (930,840)
Changes in operating assets and liabilities    
Trade accounts receivable (28,928,162) (2,488,167)
Cost and estimated earnings in excess of billings on uncompleted contracts 958,380 (2,210,937)
Prepaid expenses and other 1,080,158 815,489
Prepaid federal and state income tax 3,795,639  
Other assets 4,295 (1,115)
Trade accounts payable 5,812,549 (1,191,337)
Accrued liabilities 5,067,307 443,155
Billings in excess of cost and estimated earnings on uncompleted contracts 3,354,740 (2,853,690)
Federal and state income taxes payable 3,051,796 475,328
NET CASH PROVIDED BY OPERATING ACTIVITIES 3,181,839 5,271,194
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (978,660) (559,335)
Proceeds from sale of property and equipment 69,543 42,982
NET CASH USED IN INVESTING ACTIVITIES (909,117) (516,353)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes payable (2,576,131) (2,994,826)
Principal payments on capital lease obligations (446,911) (643,768)
Proceeds from exercise of stock options   336,764
NET CASH USED IN FINANCING ACTIVITIES (3,023,042) (3,301,830)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (750,320) 1,453,011
Effect of exchange rates on cash (87,212) (67,822)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 16,130,374 8,614,244
CASH AND CASH EQUIVALENTS AT END OF PERIOD 15,292,842 9,999,433
Supplemental cash flow information    
Interest paid 181,572 319,706
Income taxes paid 3,538,869 4,689,198
Noncash investing and financing activities    
Capital lease obligations incurred   316,850
Financed insurance premiums 167,682 156,276
Restricted stock awards to employees 100,200 54,390
Treasury shares issued for stock options exercised   $ 183,964