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Investments in Debt Securities Available for Sale - Summary of Net Realized Losses on Sales of Available for Sale Securities and Investment Income Interest and Dividends (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value Disclosures [Abstract]    
Interest and dividends accrued and paid $ 66,553 $ 442,987
Realized gains 53,354 57,895
Investment income net $ 119,907 $ 500,882