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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $)
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Balances at Dec. 31, 2010 $ 52,862,800 $ 192,423 $ 27,512,709 $ 24,666,326 $ (257,323) $ 748,665
Balances (in shares) at Dec. 31, 2010   19,242,251        
Increase (Decrease) in Stockholders' Equity            
Issuance of common stock awards 224,999 318 224,681      
Issuance of common stock awards (in shares) 109,347 31,851        
Issuance (rescindment) of restricted common stock   150 (150)      
Issuance (rescindment) of restricted common stock (in shares)   15,000        
Exercise of stock options 181,505 593 180,912      
Exercise of stock options (in shares) 59,334 59,334        
Amortization of unearned compensation restricted stock awards 28,603   28,603      
Amortization of compensation cost of unvested stock options 230,167   230,167      
Purchase of treasury shares (71)       (71)  
Foreign currency translation adjustments (641,538)         (641,538)
Net income (loss) 10,833,215     10,833,215    
Balances at Dec. 31, 2011 63,719,680 193,484 28,176,922 35,499,541 (257,394) 107,127
Balances (in shares) at Dec. 31, 2011   19,348,436        
Increase (Decrease) in Stockholders' Equity            
5% common stock dividend (1,150) 9,720 (10,870)      
5% common stock dividend (in shares)   971,990        
Cash dividend (3,097,864)     (3,097,864)    
Issuance of common stock awards (in shares) 143,602          
Issuance (rescindment) of restricted common stock   2,191 (2,191)      
Issuance (rescindment) of restricted common stock (in shares)   219,125        
Exercise of stock options 377,380 1,929 809,066   (433,615)  
Exercise of stock options (in shares) 192,949 192,949        
Amortization of unearned compensation restricted stock awards 317,109   317,109      
Amortization of compensation cost of unvested stock options 283,950   283,950      
Foreign currency translation adjustments 714,576         714,576
Net income (loss) 15,671,879     15,671,879    
Balances at Dec. 31, 2012 77,985,561 207,325 29,573,986 48,073,556 (691,009) 821,703
Balances (in shares) at Dec. 31, 2012 20,732,500 20,732,500        
Increase (Decrease) in Stockholders' Equity            
5% common stock dividend (939) 10,382 (11,321)      
5% common stock dividend (in shares)   1,038,224        
Issuance of common stock awards (in shares) 117,611          
Issuance (rescindment) of restricted common stock 273,067 (90) 273,157      
Issuance (rescindment) of restricted common stock (in shares)   (9,000)        
Exercise of stock options 416,390 3,284 973,196   (560,090)  
Exercise of stock options (in shares) 328,403 328,403        
Amortization of unearned compensation restricted stock awards 492,692   492,692      
Amortization of compensation cost of unvested stock options 206,952   206,952      
Foreign currency translation adjustments (3,926,881)         (3,926,881)
Net income (loss) (6,316,041)     (6,316,041)    
Balances at Dec. 31, 2013 $ 69,130,801 $ 220,901 $ 31,508,662 $ 41,757,515 $ (1,251,099) $ (3,105,178)
Balances (in shares) at Dec. 31, 2013 22,090,127 22,090,127