Basis of Presentation and General Information (General) (Details)	12 Months Ended
	Mar. 31, 2020 item
Basis of Presentation and General Information
Total number of vessels	24
Number of fuel-efficient ECO-design VLGCs having 84,000 cbm	19
Number of VLGCs having 82,000 cbm	3
Number of time chartered-in VLGC	2
The number of vessels that have exhaust gas cleaning systems	9
Number of VLGCs with scrubber purchase commitments that were completed	6
Number of VLGCs with scrubber purchase commitments that were in-process as of the balance sheet date	1
Number of VLGCs with scrubber purchase commitments that remain to be installed	3
Number of VLGCs with scrubber purchase commitments that currently in progress of being scrubber-equipped	1