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Note 3 - Joint Venture (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Variable Interest Entities [Table Text Block]
     
2018
   
2017
 
Cash
  $
270
    $
190
 
Property, plant and equipment, net of accumulated depreciation of $260 and $211
  $
1,881
    $
1,930