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Preferred Stock (Narrative) (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Mar. 01, 2017
Class of Stock [Line Items]      
Dividends and distributions payable $ 603,000 $ 145,000  
Series E Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred stock, shares outstanding 925,000 925,000  
Preferred stock, annual dividend rate 6.25% 6.25%  
Preferred stock, dividend rate increase resulting from failure to pay dividend, with equity offerings 9.50%    
Preferred stock, fixed annual amount of dividend per share $ 10.00    
Redeemable preferred stock, liquidation preference per share $ 10.00    
Preferred stock, percentage of conversion price at which preferred stock automatically converts to common stock 120.00%    
Preferred stock, trading days for preferred stock automatically converting to common stock 60 days    
Number of shares redeemable by company when market price is within defined range 490,250    
Preferred stock, percentage of liquidation value at which holders can sell 130.00%    
Threshold of originally issued preferred stock shares outstanding required for approval of certain transactions by preferred shareholders 434,750    
Threshold of originally issued preferred stock shares outstanding required for approval of certain transactions by preferred shareholders, percent 47.00%    
Percentage of approval required for certain transactions by preferred shareholders 75.00%    
Threshold of amount of related party transactions for approval by preferred shareholders $ 120,000    
Threshold of maximum percentage of shares grantable before shareholder approval required 9.90%    
Preferred stock, value $ 10,050,000 $ 10,050,000 $ 9,900,000
Series E Preferred Stock [Member] | On Or After February 28,2019 [Member]      
Class of Stock [Line Items]      
Conversion price per share $ 13.845    
Minimum [Member] | Series E Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred stock, percentage of liquidation value at which company can redeem preferred stock 110.00%    
Maximum [Member] | Series E Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred stock, percentage of liquidation value at which company can redeem preferred stock 130.00%    
Level 3 [Member] | Redemption Rights [Member] | Series E Preferred Stock [Member]      
Class of Stock [Line Items]      
Assets fair value     $ 150,000
KeyBank Credit Facility [Member]      
Class of Stock [Line Items]      
Cash dividends or distributions allowed to common and preferred shareholders $ 0