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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 |  |

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