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Related Party Transaction - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Oct. 07, 2016
Jul. 31, 2018
Jul. 31, 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 1,000,000
Preferred stock, par value (in usd per share)   $ 1.00 $ 1.00 $ 1.00
Series A Preferred Stock        
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      
Stock issued during period (in shares)   48,635 62,348  
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]        
Percentage of compensation fees to be paid 2.00%      
Gross proceeds from preferred stock   $ 1,200,000 1,500,000  
Equity distribution compensation expenses   $ 23,000 $ 30,000