v3.19.3
Note 2 - Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
As of December 31, 2018
 
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Financial liabilities
                               
Warrant liability
  $
-
    $
-
    $
140
    $
140
 
Total financial liabilities
  $
-
    $
-
    $
140
    $
140
 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   
Three months ended June 30,
   
Six months ended June 30,
 
   
2019
   
2018
   
2019
   
2018
 
Fair value, beginning of period
  $
234
    $
42
    $
140
    $
42
 
Change in fair value of preferred stock warrants
   
-
     
-
     
94
     
-
 
Exchange of warrants upon Merger
   
(234
)    
-
     
(234
)    
-
 
Fair value at end of period
  $
-
    $
42
    $
-
    $
42
 
   
Three months ended June 30,
   
Six months ended June 30,
 
   
2019
   
2018
   
2019
   
2018
 
                                 
Fair value, beginning of period
  $
-
    $
496
    $
-
    $
-
 
Embedded derivative liability from the issuance of Notes
   
-
     
-
     
-
     
496
 
Change in value of embedded derivatives
   
-
     
(60
)    
-
     
(60
)
Fair value at end of period
  $
-
    $
436
    $
-
    $
436