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Note 3 - Joint Venture (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Variable Interest Entities [Table Text Block]
   
2020
   
2019
 
Cash
  $
270
    $
270
 
Property, plant and equipment, net of accumulated depreciation of $433 and $408
  $
1,708
    $
1,733