Related Party Transactions - Additional Information (Detail) - USD ($)			3 Months Ended
	Oct. 07, 2016	Jun. 08, 2016	Apr. 30, 2017	Jan. 31, 2017
Related Party Transaction [Line Items]
Stock issued during period			348,000	343,000
Preferred stock, par value			$ 1.00	$ 1.00
Maximum number of preferred stock to be issued			1,000,000	1,000,000
Series A Preferred Stock [Member]
Related Party Transaction [Line Items]
Stock issued during period		320,000
Preferred stock dividend rate		9.00%
Preferred stock, par value		$ 1.00
Maximum number of preferred stock to be issued	500,000
Stock issued during period			4,349
Series A Preferred Stock [Member] | Ladenburg Thalmann & Co. Inc. [Member]
Related Party Transaction [Line Items]
Underwriting discounts, commissions and fees		$ 440,000
Percentage of structuring fee received		0.50%
Structuring fee to underwriter		$ 40,000
Percentage of compensation fees to be paid	2.00%
Gross proceeds from preferred stock			$ 100,000
Equity distribution compensation expenses			2,000
Series A Preferred Stock [Member] | Non-Executive Chairman [Member]
Related Party Transaction [Line Items]
Underwriting discounts, commissions and fees		$ 0
Equity distribution compensation expenses			$ 0