Related Party Transaction - Additional Information (Detail) - USD ($)		3 Months Ended
	Oct. 07, 2016	Apr. 30, 2018	Jan. 31, 2018
Related Party Transaction [Line Items]
Maximum number of preferred stock to be issued (in shares)		1,000,000	1,000,000
Preferred stock, par value (in dollars per share)		$ 1.00	$ 1.00
Series A Preferred Stock
Related Party Transaction [Line Items]
Preferred stock dividend rate	9.00%
Preferred stock, par value (in dollars per share)	$ 1.00
Series A Preferred Stock | Ladenburg Thalmann & Co. Inc.
Related Party Transaction [Line Items]
Maximum number of preferred stock to be issued (in shares)	500,000
Percentage of compensation fees to be paid	2.00%
Stock issued during period (in shares)		13,713
Gross proceeds from preferred stock		$ 319,000
Equity distribution compensation expenses		6,000
Series A Preferred Stock | Non-Executive Chairman
Related Party Transaction [Line Items]
Equity distribution compensation expenses		$ 0