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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock
Balance at Dec. 31, 2010 $ 122,581,609 $ 190,963 $ 31,558,693 $ 139,373,616 $ (48,541,663)
Balance (in shares) at Dec. 31, 2010   16,138,158      
Increase (Decrease) in Stockholders' Equity          
Excess tax benefit from stock-based compensation 0        
Stock-based compensation expense 1,619,652   1,619,652    
Accounting change for base jackpots 638,865     638,865  
Net income 5,675,854     5,675,854  
Balance at Dec. 31, 2011 130,515,980 190,963 33,178,345 145,688,335 (48,541,663)
Balance (in shares) at Dec. 31, 2011   16,138,158      
Increase (Decrease) in Stockholders' Equity          
Exercise of stock options, including related tax benefit 52,994   (182,623)   235,617
Exercise of stock options, including related tax benefit (in shares)   9,166      
Excess tax benefit from stock-based compensation 915        
Stock-based compensation expense 1,367,968   1,367,968    
Net income 8,910,848     8,910,848  
Balance at Dec. 31, 2012 140,847,790 190,963 34,363,690 154,599,183 (48,306,046)
Balance (in shares) at Dec. 31, 2012 16,147,324 16,147,324      
Increase (Decrease) in Stockholders' Equity          
Exercise of stock options 3,438,091   (5,071,147)   8,509,238
Exercise of stock options (in shares)   335,444      
Excess tax benefit from stock-based compensation 413,238   413,238    
Stock-based compensation expense 1,220,345   1,220,345    
Net income 17,960,822     17,960,822  
Balance at Dec. 31, 2013 $ 163,880,286 $ 190,963 $ 30,926,126 $ 172,560,005 $ (39,796,808)
Balance (in shares) at Dec. 31, 2013 16,482,768 16,482,768