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Leases - The Company as Lessee - Schedule of company's lease expenses and sub-lease income (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Charter Hire Expenses [Member]      
Lease expense for chartered-in contracts greater than 12 months     $ 318,606
Total charter hire expenses     318,606
General and Administrative Expense [Member]      
Lease expense for office leases $ 88,326 $ 97,726 90,121
Revenue [member]      
Sub lease income from chartered-in contracts greater than 12 months [1]     $ 860,227
[1] The sub-lease income represents time charter revenue earned on the chartered-in contracts greater than 12 months.