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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Non-Controlling Interests
Balance at Dec. 31, 2009 $ 39,005,441 $ 59,454 $ 15,009,613 $ 23,465,812 $ 470,562
Balance (in shares) at Dec. 31, 2009   5,945,357      
Increase (Decrease) in Stockholders' Equity          
Stock issued in lieu of compensation 79,248 103 79,145    
Stock issued in lieu of compensation (in shares)   10,291      
Share-based compensation 963,710 1,084 962,626    
Share-based compensation (in shares)   108,421      
Exercise of stock options net of shares presented for exercise 507,056 2,747 504,309    
Exercise of stock options net of shares presented for exercise (in shares)   274,760      
Net share settlement of restricted stock units and stock option tax withholding (485,511)   (485,511)    
Excess tax benefits on share-based compensation 854,015   854,015    
Net income 9,407,517     9,247,092 160,425
Distribution to non-controlling interests (105,000)       (105,000)
Balance at Dec. 31, 2010 50,226,476 63,388 16,924,197 32,712,904 525,987
Balance (in shares) at Dec. 31, 2010   6,338,829      
Increase (Decrease) in Stockholders' Equity          
Stock issued in lieu of compensation 55,000 27 54,973    
Stock issued in lieu of compensation (in shares)   2,735      
Share-based compensation 1,088,672 693 1,087,979    
Share-based compensation (in shares)   69,324      
Exercise of stock options net of shares presented for exercise 250,538 1,439 249,099    
Exercise of stock options net of shares presented for exercise (in shares)   143,858      
Net share settlement of restricted stock units and stock option tax withholding (829,995)   (829,995)    
Excess tax benefits on share-based compensation 699,659   699,659    
Net income 10,783,616     10,346,170 437,446
Distribution to non-controlling interests (289,183)       (289,183)
Balance at Dec. 31, 2011 61,984,783 65,547 18,185,912 43,059,074 674,250
Balance (in shares) at Dec. 31, 2011 6,554,746 6,554,746      
Increase (Decrease) in Stockholders' Equity          
Share-based compensation 860,405 622 859,783    
Share-based compensation (in shares)   62,153      
Exercise of stock options net of shares presented for exercise 365,241 1,330 363,911    
Exercise of stock options net of shares presented for exercise (in shares)   133,014      
Net share settlement of restricted stock units and stock option tax withholding (672,284)   (672,284)    
Excess tax benefits on share-based compensation 831,584   831,584    
Net income 10,895,297     10,895,297  
Distribution to non-controlling interests (674,250)       (674,250)
Investment in United Development Company Limited (Note 7) (329,972)   (329,972)    
Balance at Dec. 31, 2012 $ 73,260,804 $ 67,499 $ 19,238,934 $ 53,954,371  
Balance (in shares) at Dec. 31, 2012 6,749,913 6,749,913