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Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Jan. 01, 2018
USD ($)
Dec. 31, 2019
USD ($)
Segment
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Significant Accounting Policies [Line Items]            
Allowance for doubtful accounts receivable   $ 0   $ 0    
Impairment of assets, annual increase in undiscounted cash flows to determine fair value   1.00%        
Impairment of assets, inflation rate for operating expenses used to determine fair value   1.50%        
Disposal group, including discontinued operation   $ 0       $ 0
Number of reportable segments | Segment   1        
Number of operating segments | Segment   1        
Company's opening retained earnings   $ 82,942,210   80,849,086    
Unearned revenue   439,135   $ 821,577 $ 70,000 $ 70,000
Operating lease right-of-use assets   473,132 $ 1,879,085      
operating lease liabilities   473,132 1,492,697      
Other Current Assets [Member]            
Significant Accounting Policies [Line Items]            
Other current assets   $ 100,000        
Accounting Standards Update 2014-09 [Member]            
Significant Accounting Policies [Line Items]            
Contract fulfilment cost $ 300,000          
Accounting Standards Update 2016-02 [Member]            
Significant Accounting Policies [Line Items]            
Operating lease right-of-use assets     1,900,000      
operating lease liabilities     $ 1,900,000      
Effect of change [Member] | Accounting Standards Update 2014-09 [Member]            
Significant Accounting Policies [Line Items]            
Company's opening retained earnings $ 300,000          
LPG [Member]            
Significant Accounting Policies [Line Items]            
Property, plant and equipment, useful life   30 years        
Product carriers [Member]            
Significant Accounting Policies [Line Items]            
Property, plant and equipment, useful life   25 years