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Note 5 - Goodwill and Indefinite-lived Intangibles (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Goodwill [Table Text Block]
(in thousands)
  
Power and
Electro -
Mechanical
    
Energy
    
Other
    
Total
  
Balance, December 31, 2018
   $
13,089
     $
—
     $
—
     $
13,089
  
                                 
Currency translation adjustments
    
5
      
—
      
—
      
5
  
Balance, June 30, 2019
   $
13,094
     $
—
     $
—
     $
13,094