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5.50% Series B Cumulative Convertible Preferred Stock (Details)
 3 Months Ended 12 Months Ended 16 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Dec. 04, 2019
USD ($)
Mar. 31, 2021
USD ($)
day
$ / shares
shares
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2020
$ / shares
Mar. 31, 2021
$ / shares
shares
Class of Stock [Line Items]            
Series B Convertible Preferred Stock     $ 2,388,000 $ 2,555,000    
Common Stock            
Class of Stock [Line Items]            
Common Shares Issued (in shares) | shares 1,535,000   1,535,000     1,535,000
Equity Distribution Agreements With Sales Agents            
Class of Stock [Line Items]            
Percentage of the gross sales price   2.00%        
Maximum | Equity Distribution Agreements With Sales Agents            
Class of Stock [Line Items]            
Aggregate offering price (up to)   $ 40,000,000.0        
Series B Preferred Stock            
Class of Stock [Line Items]            
Preferred stock dividend rate     5.50% 5.50% 5.50%  
Initial conversion price (in dollars per share) | $ / shares $ 18.70   $ 18.70     $ 18.70
Preferred stock conversion rate     1.3372      
Annual preferred stock dividend (in dollars per share) | $ / shares     $ 1.375      
Consecutive trading days (in days) | day     45      
Days ending prior to notice of conversion     3 days      
Redemption price (in dollars per share) | $ / shares $ 25.00   $ 25.00     $ 25.00
Redemption percent of liquidation preference 103.00%   103.00%     103.00%
Liquidation preference per share (in dollars per share) | $ / shares $ 25.00   $ 25.00     $ 25.00
Series B Convertible Preferred Stock     $ 1,563,000 $ 1,730,000    
Series B preferred stock, par value (in dollars per share) | $ / shares $ 0.01   $ 0.01   $ 0.01 $ 0.01
Preferred Shares Tendered (in shares) | shares     486,000      
Series B Preferred Stock | Preferred Stock            
Class of Stock [Line Items]            
Series B Convertible Preferred Stock shares issued (in shares) | shares     0 23,000    
Gross proceeds received     $ 0 $ 439,000    
Commissions and other expenses     0 7,000    
Net proceeds     $ 0 $ 432,000    
Series B Preferred Stock | Equity Distribution Agreements With Sales Agents            
Class of Stock [Line Items]            
Aggregate offering price (up to) $ 1,200,000          
Shares sold (in shares) | shares           65,000
Series B Preferred Stock | Minimum            
Class of Stock [Line Items]            
Percent of conversion price 110.00%   110.00%     110.00%