Annual report pursuant to Section 13 and 15(d)

Note 18 - Major Customers and Segment Information - Income (Loss) in Equity Method Investments (Details)

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Note 18 - Major Customers and Segment Information - Income (Loss) in Equity Method Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income (Loss) from Equity Method Investments, Total $ (3,415) $ 4,077 $ (6,314)
MexMar [Member]      
Income (Loss) from Equity Method Investments, Total 2,736 10,103 3,556
Other Offshore Marine Services Joint Ventures [Member]      
Income (Loss) from Equity Method Investments, Total $ (6,151) $ (6,026) $ (9,870)