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Equity And Stock-Based Compensation (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Equity And Stock-Based Compensation [Line Items]            
Grant date fair value of options vesting $ 76,403   $ 34,000 $ 133,403 $ 68,000  
Unrecognized estimated compensation cost related to non-vested stock options granted 732,956     $ 732,956    
Recognition period of unrecognized compensation cost       1 year 11 months 9 days    
Intrinsic unrealized value of all options outstanding, vested and expected to vest $ 3,300,000     $ 3,300,000    
Percentage of option currently exercisable       60.20%    
Expiration period for stock options       10 years    
Common Stock authorized for issuance under 2010 Stock Incentive Plan 1,250,000     1,250,000    
Weighted average remaining contractual life of all options outstanding, vested, and expected to vest       3 years 2 months 23 days   2 years 5 months 9 days
Weighted average remaining contractual life of the exercisable options outstanding       2 years 4 months 28 days   3 years 1 month 10 days
Class A Nonvoting Common Stock [Member] | Executive Officer [Member]            
Equity And Stock-Based Compensation [Line Items]            
Stocks granted       160,643 125,209  
Class A Nonvoting Common Stock [Member] | Employee/Director [Member]            
Equity And Stock-Based Compensation [Line Items]            
Realized value of option exercised       $ 1,400,000    
Cash received from exercise of stock options       1,600,000    
Class A [Member]            
Equity And Stock-Based Compensation [Line Items]            
Compensation expense $ 300,000   $ 300,000 $ 600,000 $ 600,000  
Options granted 100,000 12,000   112,000 20,000  
Options exercised 89,500 47,500   222,100    
Class B [Member]            
Equity And Stock-Based Compensation [Line Items]            
Options exercised 85,100          
Minimum [Member]            
Equity And Stock-Based Compensation [Line Items]            
Vesting period of stock options            
Maximum [Member]            
Equity And Stock-Based Compensation [Line Items]            
Vesting period of stock options       4 years