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, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 6,858,015 $ 5,991,869
Current Liabilities, fair value   (558,801)
Assets (Liabilities) Net, fair value 21,658,206 15,096,360
Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 6,618,007 5,751,965
Assets (Liabilities) Net, fair value 6,618,007 5,751,965
Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 240,008 239,904
Assets (Liabilities) Net, fair value 15,040,199 9,903,196
Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current Liabilities, fair value   (558,801)
Assets (Liabilities) Net, fair value   (558,801)
Money Market Funds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 6,618,007 5,751,965
Money Market Funds [Member] | Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 6,618,007 5,751,965
Certificates Of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 240,008 239,904
Certificates Of Deposit [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 240,008 239,904
Accrued Consideration [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current Liabilities, fair value   (558,801)
Accrued Consideration [Member] | Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current Liabilities, fair value   (558,801)
Short-Term Investments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 5,322,407 5,742,314
Short-Term Investments [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 5,322,407 5,742,314
Short-Term Investments [Member] | Certificates Of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 1,920,119 2,582,502
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 1,920,119 2,582,502
Short-Term Investments [Member] | Corporate Notes And Bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 3,402,288 3,159,812
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 3,402,288 3,159,812
Long Term Investments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 9,477,784 3,920,978
Long Term Investments [Member] | Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 9,477,784 3,920,978
Long Term Investments [Member] | Certificates Of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 2,399,533 1,197,320
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 2,399,533 1,197,320
Long Term Investments [Member] | Corporate Notes And Bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 7,078,251 2,723,658
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 $ 7,078,251 $ 2,723,658