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Related Party Transaction - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Dec. 18, 2019
Related Party Transaction [Line Items]          
Maximum number of preferred stock to be issued (in shares) 2,000,000   2,000,000    
Preferred stock, par value (in usd per share) $ 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)     0   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) 994,046 70,282   86,938  
Preferred stock issued from at the market sale of stock program (as a percent)     100.00%    
Gross proceeds from preferred stock   $ 1,700,000   $ 2,100,000  
Equity distribution compensation expenses   $ 34,000   $ 42,000