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Note 2 - Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
 As of January 1, 2019:
Under ASC 842
  
Under ASC 840
  
Increase/(decrease)
   
Current assets:
-
  
 
  
 
Prepaid bareboat charter hire
-
  
1,656
  
(1,656)
Other noncurrent assets:
-
  
 
  
 
Prepaid bareboat charter hire
-
  
3,621
  
(3,621)
Fixed assets:
          
Right of use assets from operating leases*
21,905
  
-
  
21,905
Other current liabilities:
          
Current portion of Operating lease liabilities
4,771
  
-
  
4,771
Other noncurrent liabilities:
          
Non-current portion of Operating lease liabilities
11,857
  
-
  
11,857