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Note 4 - Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31, 2020
    
December 31, 2019
  
                 
Machinery and equipment
   $
36
     $
36
  
Leasehold improvements
    
20
      
-
  
Computers and other
    
88
      
88
  
     
144
      
124
  
Accumulated depreciation and amortization
    
(79
 )    
(52
 )
                 
Property and equipment, net
   $
65
     $
72