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Note 14 - Assets Held for Sale, Asset Sales and Asset Impairments (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Disclosure of Long-Lived Assets Held-for-sale [Table Text Block]

(In Thousands, except number of vessels)

 Three Months Ended 
  Number of Vessels  March 31, 2022  Number of Vessels  March 31, 2021 

Beginning balance

  18  $14,421   23  $34,396 

Sales

  (5)  (4,330)  (3)  (3,182)

Transfers

  (1)  (1,500)      

Ending balance

  12  $8,591   20  $31,214