Note 3 - Vessel Acquisitions and Dispositions (Details) - Vessels Disposed (Highland Piper [Member], Large Platform Supply Vessel [Member], Southeast Asia [Member])	6 Months Ended
	Jun. 30, 2014 hp T ft
Highland Piper [Member] | Large Platform Supply Vessel [Member] | Southeast Asia [Member]
Significant Acquisitions and Disposals [Line Items]
Highland Piper	1996
Highland Piper	221
Highland Piper	5,450	[1]
Highland Piper	3,115	[2]
Highland Piper	Jul-14

[1] BHP - Brake Horsepower

[2] DWT - Deadweight Tons