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Note 5 - Assets Held for Rent (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Scheduleof Assets Held for Rent [Table Text Block]
 
(In thousands)
  
December 31,
2019
  
Shippers placed in service
   $
3,073
  
Accumulated depreciation
    
(174
)
Net
    
2,899
  
Shippers and related components in production
    
1,023
  
Total
   $
3,922