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Consolidated Statements of Stockholders’ Equity (USD $) | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Total
--- | --- | --- | --- | --- | ---
Balances, at Dec. 31, 2010 | $ 11,324,866 | $ 40,700,587 | $ (28,104,216) |  | $ 23,921,237
Balances, (in Shares) at Dec. 31, 2010 | 13,362,949 |  |  |  |
Exercise of stock options | 38,846 | (7,500) |  |  | 31,346
Exercise of stock options (in Shares) | 18,427 |  |  |  | 18,427
Repurchase and retirement of shares | (4,753) | (13,689) |  |  | (18,442)
Repurchase and retirement of shares (in Shares) | (5,942) |  |  |  |
Cancellation of restricted stock (in Shares) | (238) |  |  |  |
Other proceeds |  | 3,659 |  |  | 3,659
Stock-based compensation |  | 310,956 |  |  | 310,956
Net income for the year |  |  | 6,170,231 |  | 6,170,231
Balances, at Dec. 31, 2011 | 11,358,959 | 40,994,013 | (21,933,985) |  | 30,418,987
Balances, (in Shares) at Dec. 31, 2011 | 13,375,196 |  |  |  |
Exercise of stock options | 713,746 | (295,638) |  |  | 418,108
Exercise of stock options (in Shares) | 191,585 |  |  |  | 191,585
Repurchase and retirement of shares | (1,988,288) | (7,127,545) |  |  | (9,115,833)
Repurchase and retirement of shares (in Shares) | (2,485,360) |  |  |  |
Cancellation of restricted stock (in Shares) | (81) |  |  |  |
Stock-based compensation |  | 360,699 |  |  | 360,699
Net income for the year |  |  | 4,424,142 |  | 4,424,142
Other comprehensive income (loss) |  |  |  | 44,104 | 44,104
Balances, at Dec. 31, 2012 | 10,084,417 | 33,931,529 | (17,509,843) | 44,104 | 26,550,207
Balances, (in Shares) at Dec. 31, 2012 | 11,081,340 |  |  |  |
Exercise of stock options | 2,626,352 | (1,134,178) |  |  | 1,492,174
Exercise of stock options (in Shares) | 890,034 |  |  |  | 890,033
Repurchase and retirement of shares | (851,502) | (5,686,114) |  |  | (6,537,616)
Repurchase and retirement of shares (in Shares) | (1,064,299) |  |  |  |
Cancellation of restricted stock (in Shares) | (12) |  |  |  |
Income tax effect related to stock options exercised |  | 1,090,171 |  |  | 1,090,171
Stock-based compensation |  | 430,903 |  |  | 430,903
Net income for the year |  |  | 4,180,464 |  | 4,180,464
Other comprehensive income (loss) |  |  |  | (289,085) | (289,085)
Balances, at Dec. 31, 2013 | $ 11,859,267 | $ 28,632,311 | $ (13,329,379) | $ (244,981) | $ 26,917,218
Balances, (in Shares) at Dec. 31, 2013 | 10,907,063 |  |  |  |

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