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Note 3 - Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Property, Plant and Equipment [Table Text Block]
  

Depreciable

         
  

lives

  

(in thousands)

 
  

(in years)

  

2021

  

2020

 

Computers and equipment

  3to7  $393  $10 

Furniture and fixtures

  5to7   3   3 

Property, plant and equipment, at cost

        396   13 

Less accumulated depreciation

        192   6 

Property, plant and equipment, net

       $204  $7