Note 2 - Vessel Acquisitions and Dispositions (Details) - Vessels Added (LgSPV [Member], Highland Defender [Member], North Sea [Member])	6 Months Ended
	Jun. 30, 2013 hp T ft
LgSPV [Member] | Highland Defender [Member] | North Sea [Member]
Significant Acquisitions and Disposals [Line Items]
Highland Defender	2013
Highland Defender (in Feet)	291
Highland Defender (in Horsepower)	9,574	[1]
Highland Defender (in US Ton)	5,100	[2]
Highland Defender	Jul-13

[1] BHP - Brake Horsepower

[2] DWT - Deadweight Tons