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Note 7 - Fair Value of Measurements (Tables)
 3 Months Ended
Mar. 31, 2016
Notes Tables  
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 December 31, 2015
                          
Short-term investments available for sale
  $ 10,799,890     $ 10,799,890  
─
  
─
  
                           
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
Recurring items as of March 31, 2016
                          
Earn-out milestone liability (Note 13)
   $ 14,224,068    
─
  
─
   $ 14,224,068  
                           
Recurring items as of December 31, 2015
                          
Earn-out milestone liability (Note 13)
   $ 13,921,412    
─
  
─
   $ 13,921,412