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Note 6 - Indebtedness (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Debt Activity [Table Text Block]
   
Convertible Notes Payable
  
   
Principal
    
Accrued Interest
  
Balances at January 1, 2019
   $
1,359
     $
2
  
Aggregate principal value of notes sold
    
816
      
-
  
Accrued Interest on notes
    
-
      
103
  
Aggregate principal value of notes and accrued interest converted into common stock
    
(2,175
 )    
(105
 )
      -       -  
Balances at December 31, 2019
   $
-
     $
-