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Leases (assets and liabilities) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Leases        
Operating lease income $ 6,800,000 $ 2,700,000 $ 13,600,000 $ 6,900,000
Lease term 12 months   12 months  
Weighted average discount rate (as a percent) 4.93%   4.93%  
Weighted average remaining lease term 14 months 6 days   14 months 6 days  
Operating lease right-of-use assets - Office Leases $ 1,010,256   $ 1,010,256  
Operating lease right-of-use assets - Time Charter in VLGCs 3,187,038   3,187,038  
Operating lease liabilities current - Office Leases 283,778   283,778  
Operating lease liabilities current - Time Charter in VLGCs 3,187,038   3,187,038  
Operating lease liabilities non-current - Office Leases $ 732,730   $ 732,730  
Minimum        
Leases        
Weighted average discount rate (as a percent) 3.82%   3.82%  
Maximum        
Leases        
Weighted average discount rate (as a percent) 5.53%   5.53%