Note 2 - Vessel Acquisitions and Dispositions (Tables)

9 Months Ended

Sep. 30, 2013

Additions [Member]

Note 2 - Vessel Acquisitions and Dispositions (Tables) [Line Items]

Property, Plant and Equipment, Schedule of Significant Acquisitions and Disposals [Table Text Block]

Vessel Additions Since December 31, 2012
Vessel	Region	Type(1)	Year Built	Length (feet)	BHP(2)	DWT(3)	Month Delivered
Highland Defender	N. Sea	LgPSV	2013	291	9,574	5,100	Jul-13
North Pomor	N. Sea	LgPSV	2013	304	11,935	4,700	Jul-13
Highland Chieftain	N. Sea	LgPSV	2013	260	9,574	4,000	Sep-13
Highland Guardian	N. Sea	LgPSV	2013	291	9,574	5,100	Sep-13
Highland Knight	N. Sea	LgPSV	2013	246	8,457	3,000	Oct-13

Asset under Construction [Member]

Note 2 - Vessel Acquisitions and Dispositions (Tables) [Line Items]

Property, Plant and Equipment, Schedule of Significant Acquisitions and Disposals [Table Text Block]

Vessels Under Construction as of October 22, 2013
Construction Yard	Region	Type(1)	Expected Delivery	Length (feet)	BHP(2)	DWT(3)	Expected Cost
							(millions)
Rosetti Marino	N. Sea	LgPSV	Q1 2014	246	8,457	3,000	$31.0
Simek	N. Sea	LgPSV	Q1 2014	304	11,935	4,700	$60.0
Thoma-Sea	Americas	LgPSV	Q1 2014	271	9,990	3,600	$36.0
Thoma-Sea	Americas	LgPSV	Q2 2014	271	9,990	3,600	$36.0
BAE Systems	Americas	LgPSV	Q4 2014	286	10,960	5,300	$48.0
BAE Systems	Americas	LgPSV	Q2 2015	286	10,960	5,300	$48.0

Dispositions [Member]

Note 2 - Vessel Acquisitions and Dispositions (Tables) [Line Items]

Property, Plant and Equipment, Schedule of Significant Acquisitions and Disposals [Table Text Block]

Vessels Disposed of Since December 31, 2012
Vessel	Region	Type(1)	Year Built	Length (feet)	BHP(2)	DWT(3)	Month Disposed
Clwyd Supporter	N. Sea	SpV	1984	266	10,700	1,350	Jan-13
Highland Champion	N. Sea	LgPSV	1979	265	4,800	3,910	Aug-13
Highland Pride	N. Sea	LgPSV	1992	265	6,600	3,080	Aug-13
Highland Warrior	Americas	LgPSV	1981	265	5,300	2,450	Sep-13