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Note 9 - Cost-reduction Actions (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
    June 30,
2019
  June  30,
2018
Balance as of beginning of year   $
102
    $
87
 
Additions    
     
722
 
Reductions    
(13
)    
(707
)
Balance as of end of period   $
89
    $
102