Note 2 - Vessel Acquisitions and Dispositions (Detail) - Vessels Held for Sale (Spv [Member], North Sea [Member], Clwyd Supporter [Member])	12 Months Ended
	Dec. 31, 2012 hp T ft
Spv [Member] | North Sea [Member] | Clwyd Supporter [Member]
Clwyd Supporter	1984
Clwyd Supporter (in Feet)	266
Clwyd Supporter (in Horsepower)	10,700	[1]
Clwyd Supporter (in US Ton)	1,350	[2]
Clwyd Supporter	Jan-13

[1] Brake Horsepower

[2] DWT - Deadweight Tons