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Share-Based Compensation (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Share-Based Compensation        
Total share-based compensation expense $ 182,286 $ 228,647 $ 679,340 $ 860,006
Board of Directors
       
Share-Based Compensation        
Fair value of stock granted to the Board of Directors as a part of annual retainer 60,000 60,000 60,000 60,000
Total income tax benefit recognized 55,000 71,000 227,000 272,000
Selling, general & administrative expense
       
Share-Based Compensation        
Total share-based compensation expense $ 182,286 $ 228,647 $ 679,340 $ 860,006