Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details)

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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 3,211,661 $ 5,497,788
Current Liabilities, fair value (581,750) (770,041)
Assets (Liabilities) Net, fair value 19,513,339 22,805,682
Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 3,211,661 5,497,788
Assets (Liabilities) Net, fair value 3,211,661 5,497,788
Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets (Liabilities) Net, fair value 16,883,429 18,077,935
Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current Liabilities, fair value (581,750) (770,041)
Assets (Liabilities) Net, fair value (581,750) (770,041)
Money Market Funds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 3,211,661 5,497,788
Money Market Funds [Member] | Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 3,211,661 5,497,788
Accrued Consideration [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current Liabilities, fair value (581,750) (770,041)
Accrued Consideration [Member] | Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current Liabilities, fair value (581,750) (770,041)
Short-Term Investments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 10,679,437 12,701,538
Short-Term Investments [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 10,679,437 12,701,538
Short-Term Investments [Member] | Certificates Of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 4,477,193 7,258,768
Short-Term Investments [Member] | Certificates Of Deposit [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 4,477,193 7,258,768
Short-Term Investments [Member] | Corporate Notes And Bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 4,557,917 3,800,143
Short-Term Investments [Member] | Corporate Notes And Bonds [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 4,557,917 3,800,143
Short-Term Investments [Member] | Commercial Paper [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 1,644,327 1,642,627
Short-Term Investments [Member] | Commercial Paper [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 1,644,327 1,642,627
Long Term Investments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 6,203,992 5,376,397
Long Term Investments [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 6,203,992 5,376,397
Long Term Investments [Member] | Certificates Of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 959,555 900,763
Long Term Investments [Member] | Certificates Of Deposit [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 959,555 900,763
Long Term Investments [Member] | Corporate Notes And Bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 5,244,437 4,475,634
Long Term Investments [Member] | Corporate Notes And Bonds [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments $ 5,244,437 $ 4,475,634