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Note 9 - Equity Method Investments - Summarized Financial Information on Equity Method Investments (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Non-current assets $ 1,091,272   $ 952,458
Current assets 62,546   35,993
Total assets 1,153,818   988,451
Current liabilities 54,421   $ 39,428
Voyage revenue 55,065 $ 10,333  
Net income / (loss) $ 2,721 $ (966)