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Stock-Based Compensation Plans (Schedule of Share-Based Compensation Expense) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation $ 632,818 $ 755,511 $ 786,649
Employee
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation 555,898 627,353 688,408
Nonemployee
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation $ 76,920 $ 128,158 $ 98,241