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Note 2 - Vessel Acquisitions and Dispositions (Tables)

3 Months Ended

Mar. 31, 2015

Notes Tables

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

Vessels Under Construction as of April 20, 2015
Construction Yard	Region	Type ⁽¹⁾	Expected Delivery	Length (feet)	BHP ⁽²⁾	DWT ⁽³⁾	Expected Cost
							(millions)
BAE Systems	Americas	LgPSV	Q3 2015	286	10,960	5,300	$ 48.0
BAE Systems	Americas	LgPSV	Q1 2016	286	10,960	5,300	$ 48.0
Simek	N. Sea	LgPSV	Q1 2016	304	11,935	4,700	$ 60.0

Additions [Member

Notes Tables

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

Vessel Additions Since December 31, 2014
Vessel	Region	Type ⁽¹⁾	Year Built	Length (feet)	BHP ⁽²⁾	DWT ⁽³⁾	Month Delivered

Regulus	Americas	LgPSV	2015	272	9,849	3,580	Jan-15

Disposed [Member]

Notes Tables

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

Vessels Disposed of Since December 31, 2014
Vessel	Region	Type ⁽¹⁾	Year Built	Length (feet)	BHP ⁽²⁾	DWT ⁽³⁾	Month Disposed

North Truck	N. Sea	LgPSV	1983	265	6,120	3,370	Jan-15