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Note 3 - Joint Venture (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Variable Interest Entities [Table Text Block]
   
2019
   
2018
 
Cash
  $
270
    $
270
 
Property, plant and equipment, net of accumulated depreciation of $408 and $309
  $
1,733
    $
1,832