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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
Balance, December 31, 2009 at Dec. 31, 2009 $ 223,101 $ 284,100,096 $ 17,415,158 $ (936,424) $ 300,801,931
Balance, December 31, 2009 (in Shares) at Dec. 31, 2009 22,310,110        
Forfeiture of restricted shares and stock based compensation (7) 154,449     154,442
Forfeiture of restricted shares and stock based compensation (in Shares) (667)        
Stock based compensation         154,442
Stock repurchase (12,052) (6,268,275)     (6,280,327)
Stock repurchase (in Shares) (1,205,229)       1,205,229
Net income for the period     11,093,191   11,093,191
Other comprehensive income (loss)       481,515 481,515
Balance at Dec. 31, 2010 211,042 277,986,270 28,508,349 (454,909) 306,250,752
Balance (in Shares) at Dec. 31, 2010 21,104,214        
Stock based compensation   4,071     4,071
Stock repurchase (5,516) (2,228,698)     (2,234,214)
Stock repurchase (in Shares) (551,646)       551,646
Net income for the period     8,549,791   8,549,791
Other comprehensive income (loss)       527,627 527,627
Balance at Dec. 31, 2011 205,526 275,761,643 37,058,140 72,718 313,098,027
Balance (in Shares) at Dec. 31, 2011 20,552,568        
Stock based compensation         31,268
Issuance of restricted shares and related stock based compensation 747 30,521     31,268
Issuance of restricted shares and related stock based compensation (in Shares) 74,761        
Net income for the period     28,958,487   28,958,487
Other comprehensive income (loss)       (54,340) (54,340)
Balance at Dec. 31, 2012 $ 206,273 $ 275,792,164 $ 66,016,627 $ 18,378 $ 342,033,442
Balance (in Shares) at Dec. 31, 2012 20,627,329