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Condensed Consolidated Statement of Equity (Unaudited) (USD $)
Total
Common stock
Retained earnings
Noncontrolling interests
Balance, Beginning of Period at Dec. 31, 2013 $ 79,291,843 $ 63,073,941 $ 16,394,540 $ (176,638)
Balance, Beginning of Period, shares at Dec. 31, 2013 17,985,503 17,985,503    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share-based compensation 124,989 124,989    
Share-based compensation, shares   15,300    
Exercise of options and related tax benefit 188,008 188,008    
Repurchase of shares (919,583) (919,583)    
Repurchase of shares, shares   (193,486)    
Net income (loss) 275,182   286,320 (11,138)
Balance, End of Period at Mar. 31, 2014 $ 78,960,439 $ 62,467,355 $ 16,680,860 $ (187,776)
Balance, End of Period, shares at Mar. 31, 2014 17,807,317 17,807,317