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Note 15 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
 
 
December 31
, 2016
 
                   
 
 
(Level 1)
 
 
(Level 2)
 
 
(Level 3)
 
Assets
 
 
 
 
 
 
 
 
 
 
 
 
                         
Cash and cash equivalents
  $
1,552,852
    $
    $
 
                         
Liabilities
 
 
 
 
 
 
 
 
 
 
 
 
                         
Contingent value rights distribution
  $
    $
    $
 
 
 
December 31, 2015
 
                   
 
 
(Level 1)
 
 
(Level 2)
 
 
(Level 3)
 
Assets
 
 
 
 
 
 
 
 
 
 
 
 
                         
Cash and cash equivalents
  $
1,997,192
    $
    $
 
                         
Liabilities
 
 
 
 
 
 
 
 
 
 
 
 
                         
Contingent value rights distribution
  $
    $
    $
 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   
Contingent
Value Rights
Distribution
 
Issued in connection with the Merger transaction
  $
10,000
 
         
Change in fair value upon abandonment of RES-440
   
(10,000
)
         
Balance at December 31, 2016
  $