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Subsequent Event Narrative (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Preferred Stock Tender Offer Maximum $ 43,342,384  
Preferred Stock, Par Value Per Share $ 1.00 $ 1.00
Preferred Stock Tender Offer Per Share 1,145.2  
Preferred Stock, Liquidation Preference Per Share $ 1,347.29 $ 1,291.04