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Investments: Other than temporary credit impairments (Details) - USD ($)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]        
Balance of credit-related OTTI at ending $ 370,975 $ 0 $ 370,975 $ 0
Securities not previously impaired 0 0    
Securities previously impaired 0 0    
Securities that matured or were sold during the period (realized) 0 0    
Securities due to an increase in expected cash flows $ 0 $ 0