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Note 5 - Assets Held for Rent (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Scheduleof Assets Held for Rent [Table Text Block]
(In thousands)
  
March 31, 2020
    
December 31, 2019
  
Shippers placed in service
   $
3,748
     $
3,073
  
Accumulated deprecation
    
(302
)
    
(174
)
Net
    
3,446
      
2,899
  
Shippers and related components in production
    
1,429
      
1,023
  
Total
   $
4,875
     $
3,922