Financial Instruments and Fair Value Disclosures - Carrying Value and Fair Value of Long-term Debt (Details) - USD ($)	Sep. 30, 2025	Mar. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Carrying Value	$ 529,968,695	$ 557,418,442
Japanese Financings
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Carrying Value	300,850,335	314,152,330
Corsair Japanese Financing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Carrying Value	26,270,834	27,895,834
Corsair Japanese Financing \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair Value	26,089,613	27,449,194
Cresques Japanese Financing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Carrying Value	22,956,055	23,840,367
Cresques Japanese Financing \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair Value	24,361,644	25,079,649
Cratis Japanese Financing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Carrying Value	35,380,000	37,420,000
Cratis Japanese Financing \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair Value	34,161,325	35,683,595
Copernicus Japanese Financing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Carrying Value	35,380,000	37,420,000
Copernicus Japanese Financing \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair Value	34,161,325	35,683,595
Chaparral Japanese Financing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Carrying Value	55,973,446	57,316,129
Chaparral Japanese Financing \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair Value	56,112,761	56,960,711
Caravelle Japanese Financing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Carrying Value	37,100,000	39,200,000
Caravelle Japanese Financing \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair Value	35,799,645	37,313,039
Cougar Japanese Financing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Carrying Value	38,300,000	40,100,000
Cougar Japanese Financing \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair Value	39,778,265	41,274,707
Captain Markos Dual-Fuel Japanese Financing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Carrying Value	49,490,000	50,960,000
Captain Markos Dual-Fuel Japanese Financing \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair Value	53,081,006	54,060,280
BALCAP Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Carrying Value	54,118,360	58,266,112
BALCAP Facility \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair Value	$ 52,976,276	$ 56,498,815

DORIAN LPG LTD. 10-Q