Basis of Presentation and General Information (ConRisk) (Details) - Revenue - Customer concentration - item	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Charterers individually accounting for more than 10% of revenues
Number of charterers	2	1	5
Helios LPG Pool LLC
Charterers individually accounting for more than 10% of revenues
Percentage of total revenues	69.00%	70.00%
Customer One
Charterers individually accounting for more than 10% of revenues
Percentage of total revenues			27.00%
Customer Two
Charterers individually accounting for more than 10% of revenues
Percentage of total revenues	13.00%	12.00%	19.00%
Customer Three
Charterers individually accounting for more than 10% of revenues
Percentage of total revenues	10.00%		14.00%
Customer Four
Charterers individually accounting for more than 10% of revenues
Percentage of total revenues			12.00%
Customer Five
Charterers individually accounting for more than 10% of revenues
Percentage of total revenues			11.00%