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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