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Significant Accounting Policies - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2018
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Accounting Policies [Abstract]        
Provision for federal income taxes   $ 0    
Minimum days required to stay for tax liability   183 days    
Dividend payable, amount per share $ 0.0628 $ 0.0628    
Dividend payable, date to be paid Nov. 08, 2018      
Dividends Payable, date of record Nov. 02, 2018      
Distributions paid $ 106,726 $ 1,210,590 $ 1,460,231 $ 1,972,470