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Consolidated Statements Of Stockholders' Equity And Accumulated Other Comprehensive Income (Loss) (USD $)
Total
Common Stock
Additional Paid-in Capital
Accumulated (Deficit) Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning Balance at Dec. 31, 2009 $ 81,600,310 $ 153,644 $ 96,274,199 $ (5,405,996) $ 49,582 $ (9,471,119)
Beginning Balance, Shares at Dec. 31, 2009   14,154,278        
Comprehensive income:            
Net (loss) income 8,273,212       8,273,212      
Currency translation adjustment (260,256)       260,256  
Unrealized loss on interest rate swaps (242,880)       (242,880)  
Unrealized loss on marketable securities (47,141)          (47,141)   
Comprehensive income (loss) 8,243,447               
Stock-based compensation 2,522,737    2,522,737         
Registration fees (6,962)    (6,962)         
Tax benefit from exercise of stock options 478,947   478,947      
Common stock issued under benefit plan 259,984 217 259,767         
Common stock issued under benefit plan, shares   21,654        
Acquisition of treasury stock                  
Acquisition of treasury stock, shares             
Payment of restricted stock withholdings (480,786) (377) (480,409)         
Payment of restricted stock withholdings, shares   (37,726)        
Exercise of stock options, vesting of restricted stock awards 3,684,987 5,505 3,679,482         
Exercise of stock options, vesting of restricted stock awards   550,553        
Ending Balance at Dec. 31, 2010 96,302,664 158,989 102,727,761 2,867,216 19,817 (9,471,119)
Ending Balance, Shares at Dec. 31, 2010 14,688,759 14,688,759        
Comprehensive income:            
Net (loss) income 859,649       859,649      
Currency translation adjustment (415,447)          (415,447)   
Unrealized loss on interest rate swaps (267,378)          (267,378)   
Unrealized loss on marketable securities (1)          (1)   
Comprehensive income (loss) 176,823               
Stock-based compensation 3,541,501    3,541,501         
Registration fees (10,000)    (10,000)         
Tax benefit from exercise of stock options 19,396    19,396         
Common stock issued under benefit plan 289,177 387 288,790         
Common stock issued under benefit plan, shares   38,718        
Acquisition of treasury stock (3,679,127)         (3,679,127)
Acquisition of treasury stock, shares   (457,667)        
Payment of restricted stock withholdings (624,533) (465) (624,068)         
Payment of restricted stock withholdings, shares   (46,444)        
Exercise of stock options, vesting of restricted stock awards 652,360 3,249 649,111         
Exercise of stock options, vesting of restricted stock awards   324,911        
Ending Balance at Dec. 31, 2011 96,668,261 162,160 106,592,491 3,726,865 (663,009) (13,150,246)
Ending Balance, Shares at Dec. 31, 2011 14,548,277 14,548,277        
Comprehensive income:            
Net (loss) income 3,580,615       3,580,615      
Currency translation adjustment 562,568          562,568   
Unrealized loss on interest rate swaps (31,244)          (31,244)   
Unrealized loss on marketable securities (1,303)          (1,303)   
Comprehensive income (loss) 4,110,636               
Stock-based compensation 3,679,248    3,679,248         
Tax benefit from exercise of stock options 619,138    619,138         
Common stock issued under benefit plan 270,498 273 270,225         
Common stock issued under benefit plan, shares   27,308        
Payment of restricted stock withholdings (332,710) (349) (332,361)         
Payment of restricted stock withholdings, shares   (34,929)        
Exercise of stock options, vesting of restricted stock awards $ 688,536 $ 3,642 $ 684,894         
Exercise of stock options, vesting of restricted stock awards   364,189        
Ending Balance at Sep. 30, 2012