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Note 3 - Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
Depreciable
                  
   
lives
    
(in thousands)
  
   
(in years)
    
201
9
    
201
8
  
Computers and equipment
  
3
to
7
    
$
7
    
$
7
  
Furniture and fixtures
  
5
to
7
    
 
3
    
 
3
  
Property, plant and equipment, at cost
  
 
 
 
    
 
10
    
 
10
  
Less accumulated depreciation
  
 
 
 
    
 
3
    
 
1
  
Property, plant and equipment, net
  
 
 
 
    
$
7
   
$
9