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Consolidated Statements of Stockholders’ Equity (USD $) | Common Stock [Member] | Additional Paid-in Capital [Member] | Deficit [Member] | Total
--- | --- | --- | --- | ---
Balances, at Dec. 31, 2008 |  |  |  |
Exercise of stock options | $ 46,858 | $ (21,436) |  | $ 25,422
Exercise of stock options (in Shares) | 68,707 |  |  |
Repurchase and retirement of shares | (1,214,832) | (1,701,150) |  | (2,915,982)
Repurchase and retirement of shares (in Shares) | (6,074,236) |  |  |
Issuance of restricted stock (in Shares) | 12,600 |  |  |
Issuance of restricted stock | 0 |  |  |
Cancellation of restricted stock (in Shares) | (500) |  |  |
Cancellation of restricted stock | 0 |  |  |
Stock-based compensation |  | 295,261 |  | 295,261
Net income |  |  | 12,241,206 | 12,241,206
Balances, at Dec. 31, 2009 | 14,030,384 | 47,287,351 | (30,221,164) | 31,096,571
Balances, (in Shares) at Dec. 31, 2009 | 67,080,353 |  |  |
Exercise of stock options | 27,350 | (12,541) |  | 14,809
Exercise of stock options (in Shares) | 33,678 |  |  |
Repurchase and retirement of shares | (2,732,868) | (6,974,225) |  | (9,707,093)
Repurchase and retirement of shares (in Shares) | (13,664,340) |  |  |
Cancellation of restricted stock (in Shares) | (1,100) |  |  |
Cancellation of restricted stock | 0 |  |  |
Stock-based compensation |  | 400,002 |  | 400,002
Net income |  |  | 2,116,948 | 2,116,948
Balances, at Dec. 31, 2010 | 11,324,866 | 40,700,587 | (28,104,216) | 23,921,237
Balances, (in Shares) at Dec. 31, 2010 | 53,448,591 |  |  |
Exercise of stock options | 38,846 | (7,500) |  | 31,346
Exercise of stock options (in Shares) | 73,708 |  |  |
Repurchase and retirement of shares | (4,753) | (13,689) |  | (18,442)
Repurchase and retirement of shares (in Shares) | (23,765) |  |  |
Cancellation of restricted stock (in Shares) | (950) |  |  |
Cancellation of restricted stock |  |  |  |
Other proceeds |  | 3,659 |  | 3,659
Stock-based compensation |  | 310,956 |  | 310,956
Net income |  |  | 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 | 53,497,584 |  |  |

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