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Equity - Distributions (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Schedule of Equity Method Investments                
Investment Company, Return of Capital Distribution $ 3,900,000     $ 1,900,000     $ 10,700,000 $ 12,000,000
Proceeds from Equity Method Investment, Distribution, Return of Capital             415,172 0
Dividends, Preferred Stock, Stock 3,906     3,906     11,718 11,718
Dividends, Common Stock $ 3,893,594 $ 4,429,352 $ 3,893,595 $ 4,033,127 $ 4,459,975 $ 8,832,071 $ 12,200,000 $ 17,300,000