Quarterly report pursuant to Section 13 or 15(d)

EQUITY AND EARNINGS PER SHARE (Narrative) (Details)

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EQUITY AND EARNINGS PER SHARE (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Apr. 29, 2021
Mar. 12, 2021
Feb. 02, 2021
Nov. 11, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Class of Stock                
Stock-based compensation expense               $ (1,200,000)
Dividends paid         $ 0      
Shares issued (in shares)     23,285,553          
Proceeds from issuance of common stock     $ 54,600,000   $ 53,905,000 $ 0    
Underwriters discount     2,900,000          
Stock issuance cost     $ 600,000          
Subsequent event                
Class of Stock                
Dividends paid $ 1,400,000              
Board of Directors Chairman                
Class of Stock                
Shares issued (in shares)     672,780          
Common stock equivalents                
Class of Stock                
Dilutive common stock equivalents (in shares)           964,335    
Series B Cumulative Redeemable Preferred Stock                
Class of Stock                
Preferred stock, dividend rate (as percent)       9.75% 9.75%   9.75%  
Dividends declared per share of preferred stock (in dollars per share)   $ 0.609375            
Series C Cumulative Redeemable Preferred Stock                
Class of Stock                
Preferred stock, dividend rate (as percent)       8.05% 8.05%   8.05%  
Dividends declared per share of preferred stock (in dollars per share)   0.503125            
Series D Cumulative Redeemable Preferred Stock                
Class of Stock                
Preferred stock, dividend rate (as percent)       8.375% 8.375%   8.375%  
Dividends declared per share of preferred stock (in dollars per share)   $ 0.523438            
Restricted Stock Units (RSUs)                
Class of Stock                
Shares issued upon vesting (in shares)         12,538      
Stock-based compensation expense         $ 100,000 $ 300,000    
Unrecognized stock-based compensation expense         $ 500,000      
Unrecognized stock-based compensation expense, period for recognition         1 year      
Dilutive common stock equivalents (in shares)         0 0    
Restricted Stock Units (RSUs) | Common stock equivalents                
Class of Stock                
Dilutive common stock equivalents (in shares)         881,911      
Nonemployee | Restricted Stock Units (RSUs)                
Class of Stock                
Vesting period         1 year      
Granted (in shares)         0      
Shares issued upon vesting (in shares)         5,423      
Employee | Restricted Stock Units (RSUs)                
Class of Stock                
Granted (in shares)         0      
Shares issued upon vesting (in shares)         7,115