v2.4.0.8
Common Stock (Details) (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Common Stock [Line Items]    
Realized value, options exercised $ 99,500 $ 136,000
Options exercised 50,000 95,000
Cash received for options exercised 200,000 308,000
Incremental Shares Issued [Member]
    
Common Stock [Line Items]    
Exercise price per share $ 4.01  
Market price per share $ 5.66  
In the money shares exercise of options, net 53,136  
Realized value, options exercised 124,000  
Options exercised 75,000  
Executive Officer [Member] | Class A Nonvoting Common Stock [Member]
    
Common Stock [Line Items]    
Common stock, shares issued 217,890 155,925
Options exercised 50,000 95,000
Cash received for options exercised $ 200,500 $ 308,000