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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, 2019
Dec. 31, 2018
Fair Value Disclosures [Abstract]    
Interest and dividends accrued and paid $ 442,987 $ 363,846
Realized gains (losses 57,895 (10,164)
Investment income, net $ 500,882 $ 353,682