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Voyage Expenses and Vessel Operating Expenses - Voyage Expenses (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Voyage Expenses And Vessel Operating Expenses [Abstract]      
Port expenses $ 3,170,781 $ 2,841,661 $ 2,546,926
Bunkers 8,153,437 11,641,615 6,668,126
Commissions 4,443,642 4,796,483 4,584,612
Other voyage expenses 1,222,661 1,407,416 1,916,873
Total $ 16,990,521 $ 20,687,175 $ 15,716,537