3) Investments: Investments Classified by Contractual Maturity Date (Details)	Mar. 31, 2021 USD ($)
Amortized Cost	$ 256,894,421
Estimated fair value	279,550,528
Due in 1 year
Amortized Cost	21,362,110
Estimated fair value	21,444,660
Due in 2-5 years
Amortized Cost	66,817,800
Estimated fair value	71,062,356
Due in 5-10 years
Amortized Cost	70,609,309
Estimated fair value	77,487,611
Due in more than 10 years
Amortized Cost	68,036,255
Estimated fair value	78,817,785
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Amortized Cost	29,799,733
Estimated fair value	30,455,635
Redeemable Preferred Stock
Amortized Cost	269,214
Estimated fair value	$ 282,481