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Note 18 - Derivatives (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Derivatives In ASC 815 Cash Flow Hedging Relationships [Table Text Block]
The Effect of Derivative Instruments for the six-month periods ended June 30, 2016 and 2017
Derivatives in ASC 815 Cash Flow Hedging Relationships
    Amount of Gain / (Loss) Recognized in Accumulated OCI on
Derivative
(Effective Portion)		   Location of Gain / (Loss) Recognized in Income on Derivative (Ineffective Portion)   Amount of Gain / (Loss)
Recognized in Income on
Derivative
(Ineffective Portion)
    2016   2017       2016   2017
Interest rate swaps   $
(14,550
 )   $
(1,364
 )    
Loss on derivative instruments, net
     $
-
     $
-
  
Reclassification to Interest and finance costs    
11,489
      
6,459
      
 
    
-
      
-
  
Total   $
(3,061
 )   $
5,095
      
 
   $
-
     $
-
  
Schedule of Derivatives Not Designated as Hedging Instruments under ASC 815 [Table Text Block]
Derivatives Not Designated as Hedging Instruments
and ineffectiveness of Hedging Instruments under ASC 815
    Location of Gain / (Loss)
Recognized in Income on Derivative		   Amount of Gain / (Loss)
Recognized in Income
on Derivative
        2016   2017
Non hedging interest rate swaps    
Loss on derivative instruments, net
     $
(4,101
 )   $
(897
 )
Ineffective portion of hedging interest rate swaps    
Loss on derivative instruments, net
      
-
      
-
  
Forward contracts    
Loss on derivative instruments, net
      
(158
 )    
501
  
Total    
 
     $
(4,259
 )   $
(396
 )