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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - $ / shares
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 100,000 100,000 100,000
Preferred stock, shares issued (in shares) 3,156 3,156 7,531
Preferred stock, shares outstanding (in shares) 3,156 3,156 7,531
Preferred stock, dividend rate   8.857%  
Common stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 70,000,000 70,000,000 70,000,000
Common stock, shares issued (in shares) 42,508,398 42,508,398 36,902,361
Common stock, shares outstanding (in shares) 42,508,398 42,508,398 36,902,361
Series A Preferred Stock [Member]      
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 7,500 7,500 0
Preferred stock, shares issued (in shares) 2,300 2,300 0
Preferred stock, shares outstanding (in shares) 2,300 2,300 0
Preferred stock, dividend rate 8.875% 8.875% 8.875%