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PRIVATE EXCHANGES AND REDEMPTION (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Series I, Class B  
Stock repurchase program  
Redemption (in shares) | shares 14,300
Preferred stock redemption price (in dollars per share) | $ / shares $ 7.50
Series II, Class B  
Stock repurchase program  
Preferred stock redemption price (in dollars per share) | $ / shares $ 15.00
Series III Preferred Stock  
Stock repurchase program  
Stock repurchased under the Common Stock repurchase plan (in shares) | shares 22,500
Preferred stock redemption price (in dollars per share) | $ / shares $ 15.00
Series IV Preferred Stock  
Stock repurchase program  
Stock repurchased under the Common Stock repurchase plan (in shares) | shares 342,500
Preferred stock redemption price (in dollars per share) | $ / shares $ 11.00
Series V Preferred Stock  
Stock repurchase program  
Stock repurchased under the Common Stock repurchase plan (in shares) | shares 34,000
Preferred stock redemption price (in dollars per share) | $ / shares $ 4.40
Common Stock  
Stock repurchase program  
Aggregate cash consideration | $ $ 3,786,000
Payment for repurchase of stock | $ $ 482,670
Conversion of Preferred Stock into Common Stock (in shares) | shares 754,000
Unpaid dividends in arrears waived | $ $ 7,642,049