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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
   
Total
    
Level 1
    
Level 2
    
Level 3
  
June 30, 2019:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Derivative liabilities
   $
6,046
      
-
      
-
     $
6,046
  
                                 
December 31, 2018:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Derivative liabilities
   $
4,359
      
-
      
-
     $
4,359
  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
June 30,
    
Six Months Ended
June 30,
  
   
2019
    
2018
    
2019
    
2018
  
Numerator:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net loss
   $
(4,542
 )   $
(5,739
 )   $
(13,326
 )   $
(10,697
 )
Effect of dilutive securities on net loss:                                
Common stock warrants
    
-
      
-
      
-
      
(388
 )
                                 
Total net loss for purpose of calculating diluted net loss per common share
   $
(4,542
 )   $
(5,739
 )   $
(13,326
 )   $
(11,085
 )
                                 
Number of shares used in per common share calculations:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Total shares for purpose of calculating basic net loss per common share
    
255,643,828
      
255,149,140
      
255,643,828
      
254,206,926
  
Weighted-average effect of dilutive securities:                                
Common stock warrants
    
-
      
-
      
-
      
11,315,870
  
                                 
Total shares for purpose of calculating diluted net loss per common share
    
255,643,828
      
255,149,140
      
255,643,828
      
265,522,796
  
                                 
Net loss per common share:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Basic
   $
(0.02
 )   $
(0.02
 )   $
(0.05
 )   $
(0.04
 )
Diluted
   $
(0.02
 )   $
(0.02
 )   $
(0.05
 )   $
(0.04
 )