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Note 12 - Accrued Charter Revenue, Current and Non-current and Unearned Revenue, Current and Non-current (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Unbilled Receivables, Not Billable at Balance Sheet Date [Table Text Block]
Year ending December 31,   Amount
2017   $
(5,714
 )
2018    
(8,922
 )
2019    
(6,602
 )
2020    
(802
 )
Total   $
(22,040
 )
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]
    December 31,
2016		   June 30,
2017
Hires collected in advance   $
7,924
     $
5,143
  
Deferred gain, net    
-
      
4,461
  
Charter revenue resulting from varying charter rates    
28,232
      
22,431
  
Total   $
36,156
     $
32,035
  
Less current portion    
(19,668
 )    
(17,087
 )
Non-current portion   $
16,488
     $
14,948