Significant Accounting Policies (PPE) (Details)	12 Months Ended
	Mar. 31, 2017 item
Segment reporting:
Number of reportable segments	1
Vessels
Vessels, Net
Useful life of vessels	25 years
Initial drydocking period	5 years
Drydocking period after 15 years	2 years 6 months
Number of years for initial drydocking requirement	15 years