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Related Party Transaction - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2019 | Oct. 07, 2016 | Apr. 30, 2019 | Jan. 31, 2019
Related Party Transaction [Line Items] |  |  |  |
Maximum number of preferred stock to be issued (in shares) | 1,000,000 |  | 1,000,000 | 1,000,000
Preferred stock, par value (in usd per share) | $ 1.00 |  | $ 1.00 | $ 1.00
Series A Preferred Stock | Non-Executive Chairman |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity distribution compensation expenses |  |  | $ 0 |
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 |  |
Preferred stock dividend rate |  | 9.00% |  |
Preferred stock, par value (in usd per share) |  | $ 1.00 |  |
Percentage of compensation fees to be paid |  | 2.00% |  |
Stock issued during period (in shares) | 352,982 |  | 16,656 |
Gross proceeds from preferred stock |  |  | $ 417,000 |
Equity distribution compensation expenses |  |  | $ 8,000 |

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