2) Investments: Investments Classified by Contractual Maturity Date (Details)	Dec. 31, 2020 USD ($)
Amortized Cost	$ 265,150,484
Estimated fair value	294,656,679
Due in 1 year
Amortized Cost	28,634,042
Estimated fair value	28,831,983
Due in 2-5 years
Amortized Cost	66,183,907
Estimated fair value	70,910,775
Due in 5-10 years
Amortized Cost	70,162,166
Estimated fair value	78,592,046
Due in more than 10 years
Amortized Cost	68,853,364
Estimated fair value	83,703,208
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Amortized Cost	31,047,791
Estimated fair value	32,346,062
Redeemable Preferred Stock
Amortized Cost	269,214
Estimated fair value	$ 272,605