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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, 2010 $ 50,226,000 $ 63,000 $ 16,924,000 $ 32,713,000 $ 526,000
Balance (in shares) at Dec. 31, 2010   6,339,000      
Increase (Decrease) in Stockholders' Equity          
Stock issued in lieu of compensation 55,000   55,000    
Stock issued in lieu of compensation (in shares)   3,000      
Share-based compensation 1,089,000 1,000 1,088,000    
Share-based compensation (in shares)   69,000      
Exercise of stock options net of shares presented for exercise 251,000 2,000 249,000    
Exercise of stock options net of shares presented for exercise (in shares)   144,000      
Net share settlement of restricted stock units and stock option tax w/h (830,000)   (830,000)    
Excess tax benefits on share-based compensation 700,000   700,000    
Net income 10,784,000     10,346,000 438,000
Distribution to non-controlling interests (290,000)       (290,000)
Balance at Dec. 31, 2011 61,985,000 66,000 18,186,000 43,059,000 674,000
Balance (in shares) at Dec. 31, 2011   6,555,000      
Increase (Decrease) in Stockholders' Equity          
Share-based compensation 860,000   860,000    
Share-based compensation (in shares)   62,000      
Exercise of stock options net of shares presented for exercise 365,000 1,000 364,000    
Exercise of stock options net of shares presented for exercise (in shares)   133,000      
Net share settlement of restricted stock units and stock option tax w/h (672,000)   (672,000)    
Excess tax benefits on share-based compensation 831,000   831,000    
Net income 10,895,000     10,895,000  
Distribution to non-controlling interests (674,000)       (674,000)
Investment in United Development Company Limited (Note 7) (330,000)   (330,000)    
Balance at Dec. 31, 2012 73,260,000 67,000 19,239,000 53,954,000  
Balance (in shares) at Dec. 31, 2012 6,749,913 6,750,000      
Increase (Decrease) in Stockholders' Equity          
Share-based compensation 924,000 1,000 923,000    
Share-based compensation (in shares)   38,000      
Exercise of stock options net of shares presented for exercise 191,000 1,000 190,000    
Exercise of stock options net of shares presented for exercise (in shares)   113,000      
Net share settlement of restricted stock units and stock option tax w/h (879,000)   (879,000)    
Excess tax benefits on share-based compensation 818,000   818,000    
Net income 11,276,000     11,276,000  
Balance at Dec. 31, 2013 $ 85,590,000 $ 69,000 $ 20,291,000 $ 65,230,000  
Balance (in shares) at Dec. 31, 2013 6,900,683 6,901,000