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Share-Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Board of Directors
       
Share-Based Compensation        
Total income tax benefit recognized $ 106,000 $ 102,000 $ 157,000 $ 157,000
Fair value of stock granted to the Board of Directors as a part of annual retainer 60,000 60,000 60,000 60,000
Selling, general & administrative expense
       
Share-Based Compensation        
Total share-based compensation expense $ 328,146 $ 310,153 $ 507,486 $ 497,054