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Consolidated Statements of Stockholders' Equity (USD $) | Total | Common Stock | Additional Paid in Capital | Retained Earnings | Accumulated Currency Translation Adjustment
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2009 | $ 82,143,502 | $ 134,188 | $ 60,539,768 | $ 21,469,546 |
Beginning Balance (in shares) at Dec. 31, 2009 |  | 13,418,772 |  |  |
Issuance of common stock for employee equity awards (in shares) |  | 63,612 |  |  |
Issuance of common stock for employee equity awards | 197,244 | 635 | 196,609 |  |
Tax benefit related to stock based compensation | (21,188) |  | (21,188) |  |
Stock based compensation expense | 1,102,369 |  | 1,102,369 |  |
Net income | 4,315,995 |  |  | 4,315,995 |
Other comprehensive income (loss) | (2,547,776) |  |  |  | (2,547,776)
Ending Balance at Dec. 31, 2010 | 85,190,146 | 134,823 | 61,817,558 | 25,785,541 | (2,547,776)
Ending Balance (in shares) at Dec. 31, 2010 |  | 13,482,384 |  |  |
Issuance of common stock for employee equity awards (in shares) |  | 148,223 |  |  |
Issuance of common stock for employee equity awards | 160,470 | 1,482 | 158,988 |  |
Tax benefit related to stock based compensation | 274,190 |  | 274,190 |  |
Stock based compensation expense | 1,190,697 |  | 1,190,697 |  |
Net income | 8,466,680 |  |  | 8,466,680 |
Other comprehensive income (loss) | (519,405) |  |  |  | (519,405)
Ending Balance at Dec. 31, 2011 | 94,762,778 | 136,305 | 63,441,433 | 34,252,221 | (3,067,181)
Ending Balance (in shares) at Dec. 31, 2011 |  | 13,630,607 |  |  |
Issuance of common stock for employee equity awards (in shares) |  | 235,453 |  |  |
Issuance of common stock for employee equity awards | 388,675 | 2,354 | 386,321 |  |
Tax benefit related to stock based compensation | 452,471 |  | 452,471 |  |
Stock based compensation expense | 1,151,199 |  | 1,151,199 |  |
Net income | 11,757,460 |  |  | 11,757,460 |
Other comprehensive income (loss) | 412,551 |  |  |  | 412,551
Ending Balance at Dec. 31, 2012 | $ 108,925,134 | $ 138,659 | $ 65,431,424 | $ 46,009,681 | $ (2,654,630)
Ending Balance (in shares) at Dec. 31, 2012 |  | 13,866,060 |  |  |

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