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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Charter Hire Expenses [Member]      
Lease expense for chartered-in contracts 12 months or less     $ 4,708,988
Lease expense for chartered-in contracts greater than 12 months   $ 318,606 1,560,000
Total charter hire expenses   318,606 6,268,988
General and Administrative Expense [Member]      
Lease expense for office leases $ 97,726 90,121 87,192
Revenue [member]      
Sub lease income from chartered-in contracts greater than 12 months [1]   $ 860,227 $ 3,091,390
[1] The sub-lease income represents only time charter revenue earned on the chartered-in contracts greater than 12 months. There is additional revenue of $482,879 earned from voyage charters on the same chartered-in contract which is recorded in Revenues in our consolidated statement of operations for the year ended December 31, 2019 (2020 & 2021: nil). Additionally, there is revenue earned from time charters from chartered-in contracts 12 months or less which is included in Revenues in our consolidated statements of operations for the year ended December 31, 2019. No such contracts existed for the s ended December 31, 2020 and 2021.