2) Investments: Schedule of Principal amounts due on mortgage loans held for investment by category (Details)	Dec. 31, 2017 USD ($)
Mortgage Loans Principal Amount due	$ 207,639,509
Residential Mortgage
Mortgage Loans Principal Amount due	102,527,111
Residential Construction
Mortgage Loans Principal Amount due	50,157,533
Commercial Loan
Mortgage Loans Principal Amount due	54,954,865
DueInNextYearMember
Mortgage Loans Principal Amount due	84,909,043
DueInNextYearMember | Residential Mortgage
Mortgage Loans Principal Amount due	5,454,776
DueInNextYearMember | Residential Construction
Mortgage Loans Principal Amount due	42,763,420
DueInNextYearMember | Commercial Loan
Mortgage Loans Principal Amount due	36,690,847
DueInYearsTwoThroughFiveMember
Mortgage Loans Principal Amount due	64,064,250
DueInYearsTwoThroughFiveMember | Residential Mortgage
Mortgage Loans Principal Amount due	40,995,574
DueInYearsTwoThroughFiveMember | Residential Construction
Mortgage Loans Principal Amount due	7,394,113
DueInYearsTwoThroughFiveMember | Commercial Loan
Mortgage Loans Principal Amount due	15,674,563
DueThereafterMember
Mortgage Loans Principal Amount due	58,666,216
DueThereafterMember | Residential Mortgage
Mortgage Loans Principal Amount due	56,076,761
DueThereafterMember | Commercial Loan
Mortgage Loans Principal Amount due	$ 2,589,455