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Fair Value Measurement Schedule Of Carrying Value And Fair Value Of Financial Assets Disclosed (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Apr. 02, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent consideration $ 341,250 $ 691,250 $ 691,250
Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash 26,402,136 20,810,018  
Cost-basis investments 0 0  
Accrued dividends and interest 915,703 1,037,447  
Total Financial Assets 27,317,839 21,847,465  
Contingent consideration 0 0  
Total Financial Liabilities 0 0  
Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash 0 0  
Cost-basis investments 0 0  
Accrued dividends and interest 0 0  
Total Financial Assets 0 0  
Contingent consideration 0 0  
Total Financial Liabilities 0 0  
Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash 0 0  
Cost-basis investments 1,915,614 1,952,323  
Accrued dividends and interest 0 0  
Total Financial Assets 1,915,614 1,952,323  
Contingent consideration 341,250 691,250  
Total Financial Liabilities 341,250 691,250  
Carrying Value
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash 26,402,136 20,810,018  
Cost-basis investments 1,898,023 1,871,315  
Accrued dividends and interest 915,703 1,037,447  
Total Financial Assets 29,215,862 23,718,780  
Contingent consideration 341,250 691,250  
Total Financial Liabilities 341,250 691,250  
Estimated Fair Value
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash 26,402,136 20,810,018  
Cost-basis investments 1,915,614 1,952,323  
Accrued dividends and interest 915,703 1,037,447  
Total Financial Assets 29,233,453 23,799,788  
Contingent consideration 341,250 691,250  
Total Financial Liabilities $ 341,250 $ 691,250