Long-Term Debt (Other) (Details)															1 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 29, 2022 USD ($)	Mar. 18, 2022 USD ($)	Jan. 26, 2022 USD ($)	Dec. 29, 2021 USD ($)	Nov. 30, 2021 USD ($)	Apr. 23, 2020 USD ($)	Apr. 21, 2020 USD ($)	Apr. 20, 2020	Jun. 26, 2018 USD ($)	Jun. 25, 2018 USD ($)	Mar. 16, 2018 USD ($)	Jan. 31, 2018 USD ($)	Nov. 07, 2017 USD ($)	Mar. 31, 2015 USD ($) item	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2015 USD ($)	Apr. 29, 2020 USD ($)
Long-Term Debt
Financing costs paid																$ 1,664,252	$ 4,183,321	$ 40,547
Drawdowns																298,250,000	55,378,172
Proceeds from sale of vessel																90,460,363
Presented as follows:
Total debt obligations	$ 670,020,444															670,020,444	602,087,981
Current portion of long-term debt	72,075,571															72,075,571	51,820,283
Long-term debt-net of current portion and deferred financing fees	590,687,387															590,687,387	539,651,761
Total	662,762,958															662,762,958	591,472,044
Long-term Debt, Other Disclosures [Abstract]
Deferred finance fees, beginning																10,615,937	11,152,985
Additions																2,530,589	4,158,312
Amortization																(5,889,040)	(4,695,360)	(2,893,392)
Deferred finance fees, end	7,257,486															7,257,486	10,615,937	$ 11,152,985
Corsair LPG Transport LLC
Long-Term Debt
Value of vessel transferred														$ 65,000,000.0
Term of Charter Agreement														12 years
Period until purchase option exercisable														2 years
Proceeds from sale of vessel														$ 52,000,000.0
Deposit retained by buyer														13,000,000.0
Concorde LPG Transport LLC
Long-Term Debt
Value of vessel transferred													$ 70,000,000.0
Term of Charter Agreement													13 years
Period until purchase option exercisable													3 years
Proceeds from sale of vessel													$ 56,000,000.0
Deposit retained by buyer													14,000,000.0
Corvette LPG Transport LLC
Long-Term Debt
Value of vessel transferred												$ 70,000,000.0
Term of Charter Agreement												13 years
Period until purchase option exercisable												3 years
Proceeds from sale of vessel												$ 56,000,000.0
Deposit retained by buyer												14,000,000.0
CMNL
Long-Term Debt
Value of vessel transferred											$ 45,800,000
Term of Charter Agreement											7 years
Period until purchase option exercisable											2 years
Proceeds from sale of vessel											$ 20,600,000
Deposit retained by buyer											$ 25,200,000
CNML
Long-Term Debt
Value of vessel transferred										$ 50,800,000
Term of Charter Agreement										7 years
Period until purchase option exercisable										2 years
Proceeds from sale of vessel										$ 22,900,000
Deposit retained by buyer										$ 27,900,000
Dorian Dubai LPG Transport LLC (Cresques)
Long-Term Debt
Value of vessel transferred							$ 71,500,000
Term of Charter Agreement							12 years
Period until purchase option exercisable							3 years
Proceeds from sale of vessel							$ 52,500,000
Deposit retained by buyer							$ 19,000,000.0
Repayment of debt								$ 28,500,000
Cratis LPG Transport LLC
Long-Term Debt
Value of vessel transferred			$ 70,000,000.0
Term of Charter Agreement			9 years
Period until purchase option exercisable			3 years
Proceeds from sale of vessel			$ 50,000,000.0
Deposit retained by buyer			20,000,000.0
Copernicus LPG Transport LLC
Long-Term Debt
Value of vessel transferred			$ 70,000,000.0
Term of Charter Agreement			9 years
Period until purchase option exercisable			3 years
Proceeds from sale of vessel			$ 50,000,000.0
Deposit retained by buyer			$ 20,000,000.0
Chaparral LPG Transport LLC
Long-Term Debt
Value of vessel transferred		$ 64,900,000
Term of Charter Agreement		7 years
Period until purchase option exercisable		5 years
Period until purchase option exercisable extension period		3 years
Proceeds from sale of vessel		$ 64,900,000
Principal payment frequency		monthly
Caravelle LPG Transport LLC
Long-Term Debt
Value of vessel transferred	$ 71,500,000															71,500,000
Term of Charter Agreement	10 years
Period until purchase option exercisable	3 years
Proceeds from sale of vessel	$ 50,000,000.0
Deposit retained by buyer	21,500,000															21,500,000
2015 Facility
Long-Term Debt
Original loan amount															$ 758,000,000				$ 758,000,000
Number of tranches in which loan facility is divided | item															4
Number of VLGC newbuildings secured by loan | item															15
Repayment of debt												33,700,000	35,100,000
The amount of restricted cash released												$ 1,600,000	$ 1,600,000
Presented as follows:
Total debt obligations	$ 206,381,274															$ 206,381,274	385,011,186
2015 Facility | LIBOR
Long-Term Debt
Margin added to LIBOR for interest rate on loan facility (as a percent)																2.40%
Interest Rate	0.97403%															0.97403%
Commercial Financing
Long-Term Debt
Original loan amount															$ 249,000,000				249,000,000
Term															7 years
Interest Rate	3.37%															3.37%
Loan term period																3 years
Presented as follows:
Total debt obligations	$ 91,651,888															$ 91,651,888	155,205,698
Commercial Financing | LIBOR
Long-Term Debt
Margin added to LIBOR for interest rate on loan facility (as a percent)															2.50%	2.40%
KEXIM Direct Financing
Long-Term Debt
Original loan amount															$ 204,000,000				$ 204,000,000
Term															12 years
Interest Rate	3.42%															3.42%
Presented as follows:
Total debt obligations	$ 44,406,733															$ 44,406,733	89,474,512
KEXIM Direct Financing | LIBOR
Long-Term Debt
Margin added to LIBOR for interest rate on loan facility (as a percent)																			2.45%
KEXIM Guaranteed and K-sure Insured
Long-Term Debt
Original loan amount															$ 305,000,000				$ 305,000,000
KEXIM Guaranteed
Long-Term Debt
Original loan amount															$ 202,000,000				$ 202,000,000
Term															12 years
Interest Rate	2.37%															2.37%
Presented as follows:
Total debt obligations	$ 47,190,358															$ 47,190,358	93,997,081
KEXIM Guaranteed | LIBOR
Long-Term Debt
Margin added to LIBOR for interest rate on loan facility (as a percent)																			1.40%
K-sure Insured
Long-Term Debt
Original loan amount															$ 103,000,000				$ 103,000,000
Term															12 years
Interest Rate	2.47%															2.47%
Presented as follows:
Total debt obligations	$ 23,132,295															$ 23,132,295	46,333,895
K-sure Insured | LIBOR
Long-Term Debt
Margin added to LIBOR for interest rate on loan facility (as a percent)																			1.50%
2017 Bridge Loan
Long-Term Debt
Repayment of debt														$ 30,100,000
Japanese Financing Agreement [Member]
Presented as follows:
Total debt obligations	382,064,998															382,064,998	217,076,795
Corsair Japanese Financing
Long-Term Debt
Term of Charter Agreement														12 years
Stated rate (as a percent)														4.90%
Financing cost to be incurred														$ 100,000
Monthly brokerage commission (as a percent)														1.25%
Brokerage commission fee on exercised purchase option (as a percent)														1.00%
Periodic principal payment amount														$ 300,000
Principal payment frequency														monthly
Balloon payment amount														$ 13,000,000.0
Presented as follows:
Total debt obligations	37,645,833															37,645,833	40,895,833
Concorde Japanese Financing
Long-Term Debt
Stated rate (as a percent)													4.90%
Financing cost to be incurred													$ 100,000
Monthly brokerage commission (as a percent)													1.25%
Brokerage commission fee on exercised purchase option (as a percent)													1.00%
Periodic principal payment amount													$ 300,000
Principal payment frequency													monthly
Balloon payment amount													$ 14,000,000.0
Presented as follows:
Total debt obligations	42,269,231															42,269,231	45,500,000
Corvette Japanese Financing
Long-Term Debt
Stated rate (as a percent)												4.90%
Financing cost to be incurred												$ 100,000
Monthly brokerage commission (as a percent)												1.25%
Brokerage commission fee on exercised purchase option (as a percent)												1.00%
Periodic principal payment amount												$ 300,000
Principal payment frequency												monthly
Balloon payment amount												$ 14,000,000.0
Presented as follows:
Total debt obligations	42,807,692															42,807,692	46,038,462
CJNP Japanese Financing | CMNL
Long-Term Debt
Deposit retained by buyer						$ 25,200,000
Vessel purchase price						$ 15,800,000
CMNL Japanese Financing
Long-Term Debt
Stated rate (as a percent)											6.00%
Financing cost to be incurred											$ 100,000
Monthly brokerage commission (as a percent)											1.25%
Brokerage Commission Fee on delivery Purchase Option (as a percent)											0.50%
Brokerage commission fee on exercised purchase option (as a percent)											0.50%
Periodic principal payment amount											$ 100,000
Principal payment frequency											monthly
Balloon payment amount											$ 11,000,000.0
Presented as follows:
Total debt obligations																	16,706,845
CNML Japanese Financing
Long-Term Debt
Stated rate (as a percent)										6.00%
Financing cost to be incurred										$ 100,000
Monthly brokerage commission (as a percent)										1.25%
Brokerage Commission Fee on delivery Purchase Option (as a percent)										0.50%
Brokerage commission fee on exercised purchase option (as a percent)										0.50%
Periodic principal payment amount										$ 100,000
Principal payment frequency										monthly
Balloon payment amount										$ 13,000,000.0
Presented as follows:
Total debt obligations																	18,855,655
CNML Japanese Financing | CNML
Long-Term Debt
Deposit retained by buyer				$ 27,900,000
Vessel purchase price				$ 17,800,000
Cresques Japanese Financing
Long-Term Debt
Monthly brokerage commission (as a percent)							1.25%
Percentage of broker commission fee payable							0.50%
Periodic principal payment amount							$ 300,000
Principal payment frequency							monthly
Balloon payment amount							$ 11,500,000
Presented as follows:
Total debt obligations	45,660,000															45,660,000	$ 49,080,000
Cresques Japanese Financing | LIBOR
Long-Term Debt
Margin added to LIBOR for interest rate on loan facility (as a percent)							2.50%
Cratis Japanese Financing
Long-Term Debt
Stated rate (as a percent)			4.10%
Loan term period			9 years
Estimated financing cost to be incurred			$ 300,000
Brokerage Commission Fee on delivery Purchase Option (as a percent)			1.25%
Brokerage commission fee on exercised purchase option (as a percent)			0.50%
Periodic principal payment amount			$ 300,000
Principal payment frequency			monthly
Balloon payment amount			$ 13,300,000
Presented as follows:
Total debt obligations	49,660,000															49,660,000
Cratis Japanese Financing | Cratis LPG Transport LLC
Long-Term Debt
Term of Charter Agreement			9 years
Copernicus Japanese Financing
Long-Term Debt
Stated rate (as a percent)			4.10%
Loan term period			9 years
Financing cost to be incurred			$ 300,000
Brokerage Commission Fee on delivery Purchase Option (as a percent)			1.25%
Brokerage commission fee on exercised purchase option (as a percent)			0.50%
Periodic principal payment amount			$ 300,000
Principal payment frequency			monthly
Balloon payment amount			$ 13,300,000
Presented as follows:
Total debt obligations	49,660,000															49,660,000
Chaparral Japanese Financing
Long-Term Debt
Stated rate (as a percent)		5.30%
Loan term period		7 years
Financing cost to be incurred		$ 100,000
Periodic principal payment amount		500,000
Vessel purchase price		45,800,000
Presented as follows:
Total debt obligations	$ 64,662,242															$ 64,662,242
Caravelle Japanese Financing
Long-Term Debt
Stated rate (as a percent)	4.20%															4.20%
Loan term period	10 years
Estimated financing cost to be incurred	$ 300,000															$ 300,000
Brokerage Commission Fee on delivery Purchase Option (as a percent)	1.25%
Brokerage commission fee on exercised purchase option (as a percent)	0.50%															0.50%
Periodic principal payment amount	$ 300,000
Principal payment frequency	monthly
Balloon payment amount	$ 14,000,000.0															$ 14,000,000.0
Presented as follows:
Total debt obligations	49,700,000															49,700,000
Refinancing Of Commercial Tranche Of 2015 Facility
Long-Term Debt
Security leverage ratio									40.00%											40.00%
Additional basis points to decrease the margin									0.10%											0.10%
Basis points receivable as increase or reduction for changes in Average Efficiency Ratio									0.10%											0.10%
Refinancing Of Commercial Tranche Of 2015 Facility | LIBOR
Long-Term Debt
Margin added to LIBOR for interest rate on loan facility (as a percent)									2.50%
Refinancing Of Commercial Tranche Of 2015 Facility | Minimum
Long-Term Debt
Additional basis points to increase the margin									0.10%											0.10%
Refinancing Of Commercial Tranche Of 2015 Facility | Maximum
Long-Term Debt
Security leverage ratio									60.00%											60.00%
New senior secured term loan facility
Long-Term Debt
Original loan amount																				$ 155,800,000
New senior secured revolving credit facility | Maximum
Long-Term Debt
Original loan amount																				$ 25,000,000.0
2015 AR Facility | Cratis LPG Transport LLC
Long-Term Debt
Repayment of debt			25,100,000
2015 AR Facility | Copernicus LPG Transport LLC
Long-Term Debt
Repayment of debt			$ 25,300,000
2015 AR Facility | Chaparral LPG Transport LLC
Long-Term Debt
Repayment of debt		$ 24,000,000.0
2015 AR Facility | Caravelle LPG Transport LLC
Long-Term Debt
Repayment of debt	24,800,000
BALCAP Facility
Long-Term Debt
Original loan amount					$ 83,400,000
Drawdowns					$ 34,900,000
Stated rate (as a percent)					3.78%
Loan term period					5 years
Periodic principal payment amount					$ 900,000
Principal payment frequency					monthly
Balloon payment amount					$ 44,100,000
Security leverage ratio					125.00%
Presented as follows:
Total debt obligations	$ 81,574,172															$ 81,574,172