Note 3 - Vessel Acquisitions and Dispositions (Tables)

6 Months Ended

Jun. 30, 2014

Asset under Construction [Member]

Note 3 - 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 July 21, 2014
Construction Yard	Region	Type(1)	Expected Delivery	Length (feet)		BHP(2)		DWT(3)		Expected Cost
										(millions)
Thoma-Sea	Americas	LgPSV	Q4 2014		271		9,990		3,600		$36
BAE Systems	Americas	LgPSV	Q1 2015		286		10,960		5,300		$48
BAE Systems	Americas	LgPSV	Q2 2015		286		10,960		5,300		$48
Simek	North Sea	LgPSV	Q4 2015		304		11,935		4,700		$60

Additions [Member]

Note 3 - 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, 2013
Vessel	Region	Type(1)	Year Built	Length (feet)		BHP(2)		DWT(3)		Month Delivered/ Acquired
North Cruys	N. Sea	LgPSV	2014		304		11,935		4,700	Feb-14
Highland Princess	N. Sea	LgPSV	2014		246		8,487		3,900	Mar-14
Polaris	Americas	LgPSV	2014		271		9,990		3,600	Apr-14

Acquired [Member]

Note 3 - Vessel Acquisitions and Dispositions (Tables) [Line Items]

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

Vessels Acquired Since December 31, 2013
Vessel	Region	Type(1)	Year Built	Length (feet)		BHP(2)		DWT(3)		Month Aquired
Highland Duke	N. Sea	LgPSV	2012		246		7,483		3,133	Feb-14

Disposed [Member]

Note 3 - 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, 2013
Vessel	Region	Type(1)	Year Built	Length (feet)		BHP(2)		DWT(3)		Month Disposed
Highland Piper	SEA	LgPSV	1996		221		5,450		3,115	Jul-14