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STATEMENTS OF CASH FLOWS (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from operating activities: |  |  |
Net income | $ 11,011,130 | $ 7,416,928 | $ 529,896
Adjustments to reconcile net income to net cash used in operating activities: |  |  |
Depreciation and amortization | 623,795 | 591,373 | 386,394
Deferred rent | 90,419 | 266,909 | (4,832)
Stock-based compensation expense | 382,657 | 985,600 | 553,629
Common stock issued as employee compensation | 37,761 | 36,157 | 27,168
Deferred portion of provision for income taxes | 11,000 | (103,000) | (265,000)
Tax benefit for stock options | (313,000) | (438,000) | (304,000)
Bad debts | (50,000) | 75,000 | 0
Changes in operating assets and liabilities: |  |  |
(Increase) decrease in accounts receivable | (3,951,680) | 1,791,974 | (878,612)
Increase in costs and estimated earnings in excess of billings on uncompleted contracts | (29,783,016) | (31,942,776) | (4,136,426)
Decrease (increase) in prepaid expenses and other current assets | 240,263 | (8,220) | (125,853)
Increase in accounts payable and accrued expenses | 1,465,562 | 4,423,371 | 2,199,337
Increase (decrease) in income taxes payable | (2,383,000) | 3,105,994 | (1,930,368)
Increase (decrease) in billings in excess of costs and estimated earnings on uncompleted contracts | 540,387 | 97,580 | (10,519)
Net cash used in operating activities | (22,077,722) | (13,701,110) | (3,959,186)
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (825,110) | (1,587,898) | (300,803)
Net cash used in investing activities | (825,110) | (1,587,898) | (300,803)
Cash flows from financing activities: |  |  |
Proceeds from exercise of stock options | 1,290,515 | 455,447 | 1,101,529
Proceeds from sale of common stock | 13,323,694 | 0 | 3,529,541
Payment of line of credit | (4,000,000) | 0 | (2,200,000)
Proceeds from line of credit | 11,350,000 | 15,300,000 | 800,000
Payment of long-term debt | (2,042,774) | (849,615) | (676,530)
Proceeds from long-term debt | 4,500,000 | 0 | 0
Tax benefit for stock options | 313,000 | 438,000 | 304,000
Net cash provided by financing activities | 24,734,435 | 15,343,832 | 2,858,540
Net increase (decrease) in cash | 1,831,603 | 54,824 | (1,401,449)
Cash at beginning of year | 878,200 | 823,376 | 2,224,825
Cash at end of year | 2,709,803 | 878,200 | 823,376
Supplemental schedule of noncash investing and financing activities: |  |  |
Equipment acquired under capital lease | 76,592 | 751,129 | 113,686
Settlement of other receivables | 0 | 30,000 | 60,000
Accrued expenses settled in exchange for common stock | 228,290 | 0 | 99,696
Stock options proceeds paid with Company's stock | 0 | 159,000 | 288,420
Supplemental schedule of cash flow information: |  |  |
Cash paid during the year for interest | 783,373 | 366,491 | 158,406
Cash paid for income taxes | $ 7,886,409 | $ 180,000 | $ 2,276,367

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