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Leases - Time Charter-in Contracts (Details)
3 Months Ended 6 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Mar. 31, 2023
USD ($)
Lessee, Lease, Description [Line Items]          
Charter hire expenses $ 12,068,419 $ 5,358,333 $ 22,615,229 $ 10,760,478  
Operating lease right-of-use assets 207,234,723   207,234,723   $ 158,179,398
Time Charter-in VLGCs          
Lessee, Lease, Description [Line Items]          
Operating lease right-of-use assets 205,824,100   205,824,100   $ 156,524,900
Helios LPG Pool LLC          
Lessee, Lease, Description [Line Items]          
Pool revenue - time chartered-in VLGCs $ 27,800,000 $ 6,800,000 $ 46,200,000 $ 13,600,000  
Helios LPG Pool LLC | Dual-Fuel Panamax VLGC (The Cristobal)          
Lessee, Lease, Description [Line Items]          
Number of option periods to extend time charter-in commitments 2   2    
Duration of time charter-in option periods     1 year    
Helios LPG Pool LLC | Dual-Fuel Panamax VLGC (The Cristobal) | Time Charter-in VLGCs          
Lessee, Lease, Description [Line Items]          
Operating lease right-of-use assets $ 62,600,000   $ 62,600,000    
Helios LPG Pool LLC | Dual-Fuel Panamax VLGC (The Cristobal) | Minimum          
Lessee, Lease, Description [Line Items]          
Duration of Dual-fuel Panamax LPG time charter-in commitments     7 years    
Helios LPG Pool LLC | Dual-Fuel Panamax VLGC (The Cristobal) | Maximum          
Lessee, Lease, Description [Line Items]          
Duration of Dual-fuel Panamax LPG time charter-in commitments     9 years