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Note 11 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
 
 
September 30, 2016
 
 
 
(Level 1)
 
 
(Level 2)
 
 
(Level 3)
 
Assets
 
 
 
 
 
 
 
 
 
 
 
 
Cash and cash equivalents
  $ 3,021,388     $     $  
 
 
December 31, 2015
 
 
 
(Level 1)
 
 
(Level 2)
 
 
(Level 3)
 
Assets
 
 
 
 
 
 
 
 
 
 
 
 
Cash and cash equivalents
  $ 1,997,192     $     $  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   
Contingent
Consideration
 
Issued in connection with the Merger transaction
  $ 10,000  
Change in fair value upon abandonment of RES-440
    (10,000 )
Balance at September 30, 2016
  $