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Sale and Leaseback of Vessels - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Dec. 16, 2016
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Gas Premiership and Gas Cathar [Member]              
Sale Leaseback Transaction [Line Items]              
Sale leaseback transaction, term of lease 5 years 3 months 18 days           4 years
Sale leaseback transaction, deferred gain, gross             $ 780,695
Gas Premiership and Gas Cathar [Member] | Charter Hire Expenses [Member]              
Sale Leaseback Transaction [Line Items]              
Sale leaseback transaction, current period gain recognized       $ 190,087 $ 195,040 $ 195,574  
Astrid and Kazak [Member]              
Sale Leaseback Transaction [Line Items]              
Sale leaseback transaction, term of lease   12 months 12 months 12 months      
Astrid and Kazak [Member] | Bareboat Charters [Member]              
Sale Leaseback Transaction [Line Items]              
Minimum lease payments, sale leaseback transactions, next twelve months   $ 1,560,000   $ 1,560,000      
Minimum lease payments, sale leaseback transactions, within two years   $ 390,000   390,000      
Astrid and Kazak [Member] | Charter Hire Expenses [Member] | Bareboat Charters [Member]              
Sale Leaseback Transaction [Line Items]              
Sale leaseback transaction, rent expense       $ 3,434,250 $ 3,719,810 $ 4,249,961