Note 3 - Vessel Acquisitions and Dispositions - Vessels Under Construction (Details) - Simek [Member] - North Sea [Member] - Large Platform Supply Vessel [Member] - Subsequent Event [Member] $ in Millions	Nov. 09, 2016 USD ($) T hp
Vessels Under Construction, Length	304
Vessels Under Construction, Brake Horsepower | hp	11,935	[1]
Vessels Under Construction, Deadweight Tons | T	4,700	[2]
Vessels Under Construction, Expected Cost | $	$ 60

[1] BHP - Brake Horsepower

[2] DWT - Deadweight Tons