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Note 6 - Vessels, Net (Details Textual)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Gain (Loss) on Sale Vessels $ (3,638) $ 0  
Vessel Held For Sale 7,035   $ 6,256
Gain (Loss) on Assets Held for Sale $ (2,732) $ 0  
Number of Vessels Provided as Collaterals to Secure Loans 46    
Carrying Value of Vessels Provided as Collaterals to Secure Loans $ 1,636,384    
Number of Vessels Under Sale and Leaseback Transactions 7    
Marina Vessel [Member]      
Vessels, Disposal Price $ 4,670    
Gain (Loss) on Sale Vessels (3,638)    
MSC Mandraki [Member]      
Vessel Held For Sale 7,035    
Gain (Loss) on Assets Held for Sale $ (2,732)