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Leases (Charter hire expenses) (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Time Charter-in        
Charter hire expenses $ 5,358,333 $ 2,403,968 $ 10,760,478 $ 5,912,038