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Consolidated Statements of Stockholders' Equity (USD $)
Total
Common Stock
Additional Paid in Capital
Retained Earnings
Accumulated Currency Translation Adjustment
Beginning Balance at Dec. 31, 2009 $ 82,143,502 $ 134,188 $ 60,539,768 $ 21,469,546  
Beginning Balance (in shares) at Dec. 31, 2009   13,418,772      
Issuance of common stock for employee equity awards (in shares)   63,612      
Issuance of common stock for employee equity awards 197,244 635 196,609    
Tax benefit related to stock based compensation (21,188)   (21,188)    
Stock based compensation expense 1,102,369   1,102,369    
Net income 4,315,995     4,315,995  
Other comprehensive income (loss) (2,547,776)       (2,547,776)
Ending Balance at Dec. 31, 2010 85,190,146 134,823 61,817,558 25,785,541 (2,547,776)
Ending Balance (in shares) at Dec. 31, 2010   13,482,384      
Issuance of common stock for employee equity awards (in shares)   148,223      
Issuance of common stock for employee equity awards 160,470 1,482 158,988    
Tax benefit related to stock based compensation 274,190   274,190    
Stock based compensation expense 1,190,697   1,190,697    
Net income 8,466,680     8,466,680  
Other comprehensive income (loss) (519,405)       (519,405)
Ending Balance at Dec. 31, 2011 94,762,778 136,305 63,441,433 34,252,221 (3,067,181)
Ending Balance (in shares) at Dec. 31, 2011   13,630,607      
Issuance of common stock for employee equity awards (in shares)   235,453      
Issuance of common stock for employee equity awards 388,675 2,354 386,321    
Tax benefit related to stock based compensation 452,471   452,471    
Stock based compensation expense 1,151,199   1,151,199    
Net income 11,757,460     11,757,460  
Other comprehensive income (loss) 412,551       412,551
Ending Balance at Dec. 31, 2012 $ 108,925,134 $ 138,659 $ 65,431,424 $ 46,009,681 $ (2,654,630)
Ending Balance (in shares) at Dec. 31, 2012   13,866,060