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 6 Months Ended 12 Months Ended
Aug. 05, 2021
Jul. 30, 2021
May 07, 2021
Apr. 29, 2021
Mar. 12, 2021
Feb. 02, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Class of Stock                      
Dividends paid       $ 1,400,000         $ 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%   9.75%
Dividends declared per share of preferred stock (in dollars per share)     $ 0.609375   $ 0.609375            
Series B Cumulative Redeemable Preferred Stock | Subsequent event                      
Class of Stock                      
Preferred stock, dividend rate (as percent) 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%   8.05%
Dividends declared per share of preferred stock (in dollars per share)     $ 0.503125   $ 0.503125            
Series C Cumulative Redeemable Preferred Stock | Subsequent event                      
Class of Stock                      
Preferred stock, dividend rate (as percent) 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%   8.375%
Dividends declared per share of preferred stock (in dollars per share)     $ 0.523438   $ 0.523438            
Series D Cumulative Redeemable Preferred Stock | Subsequent event                      
Class of Stock                      
Preferred stock, dividend rate (as percent) 8.375%                    
Dividends declared per share of preferred stock (in dollars per share) $ 0.523438                    
Preferred Stock                      
Class of Stock                      
Cumulative preferred stock unpaid dividend             $ 5,600,000   $ 5,600,000    
Restricted Stock Units (RSUs)                      
Class of Stock                      
Shares issued upon vesting (in shares)                 66,943    
Stock-based compensation expense               $ 200,000   $ 500,000  
Unrecognized stock-based compensation expense             $ 300,000   $ 300,000    
Unrecognized stock-based compensation expense, period for recognition                 8 months 19 days    
Dilutive common stock equivalents (in shares)             0 0 0 0  
Restricted Stock Units (RSUs) | Common stock equivalents                      
Class of Stock                      
Dilutive common stock equivalents (in shares)             542,438   711,237 964,335  
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)                 61,520