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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 ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value Disclosures [Abstract]    
Interest and dividends accrued and paid $ 45,077 $ 104,410
Realized gains 43,232 9,381
Investment income, net $ 88,309 $ 113,791