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Share-Based Compensation (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Board of Directors
       
Share-Based Compensation        
Total income tax benefit recognized $ 58,000 $ 55,000 $ 215,000 $ 227,000
Fair value of stock granted to the Board of Directors as a part of annual retainer     60,000 60,000
Selling, general & administrative expense
       
Share-Based Compensation        
Total share-based compensation expense $ 199,967 $ 182,286 $ 707,453 $ 679,340