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Note 6 - Fair Value of Measurements (Tables)
9 Months Ended
Sep. 30, 2014
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

Total Fair

Value on

the

Balance

Sheet

   

Quoted

Prices

In Active

Markets

For

Identical

Assets

/Liabilities

(Level 1)

   

Significant

Other

Observable

Inputs

(Level 2)

   

Significant

Unobservable

Inputs

(Level 3)

 

Assets:

                               

Recurring items as of September 30, 2014

                               

Short-term investments available for sale Bonds – corporate issuances

  $ 39,047,820     $ 39,047,820     $     $  
                                 

Non-recurring items as of September 30, 2014

                               

In-process research and development

  $ 25,801,728     $     $     $ 25,801,728  
                                 

Goodwill

  $ 1,976,101     $     $     $ 1,976,101  
                                 

Recurring items as of December 31, 2013

                               

Short-term investments available for sale Bonds – corporate issuances

  $ 37,156,381     $ 37,156,381     $     $  
                                 

Liabilities:

                               

Recurring items as of September 30, 2014

                               

Common stock warrant liability

  $ 398,044     $     $     $ 398,044  
                                 

Earnout milestone liability

  $ 13,877,659     $     $     $ 13,877,659  
                                 

As of December 31, 2013

                               

Common stock warrant liability

  $ 3,026     $     $     $ 3,026