XML 84 R71.htm IDEA: XBRL DOCUMENT v3.19.1
Voyage Expenses and Vessel Operating Expenses - Voyage Expenses (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Voyage Expenses And Vessel Operating Expenses [Abstract]      
Port expenses $ 2,841,661 $ 2,546,926 $ 3,306,157
Bunkers 11,641,615 6,668,126 6,117,326
Commissions 4,796,483 4,584,612 4,259,812
Other voyage expenses 1,407,416 1,916,873 1,706,970
Total $ 20,687,175 $ 15,716,537 $ 15,390,265