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Note 3 - Property, Plant and Equipment (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
(in thousands)
 
   
March 31
,
   
December 31,
 
   
201
9
   
2018
 
Computers and equipment
 
$
7
    $
7
 
Furniture and fixtures
 
 
3
     
3
 
Property, plant and equipment, at cost
 
 
10
     
10
 
Less accumulated depreciation
 
 
1
     
1
 
Property, plant and equipment, net
 
$
9
    $
9