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Note 7 - Deferred Charges, Net (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Deferred Charges [Table Text Block]
  Dry-docking
and Special
Survey Costs
Balance, January 1, 2017   $
20,367
 
Additions    
1,802
 
Amortization    
(3,911
)
Write-off    
(2
)
Balance, June 30, 2017   $
18,256