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Note 11 - Plant Consolidations (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Restructuring and Related Costs [Table Text Block]
    Three Months Ended
June 30,
  Six Months Ended
June 30,
Restructuring Costs   2017   2016   2017   2016
Relocation   $
63
    $
55
    $
63
    $
178
 
Total   $
63
    $
55
    $
63
    $
178