3) Investments: Schedule of Unrealized Loss on Investments (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Held-to-maturity Securities, Unrecognized Holding Loss	$ 2,660,816	$ 1,820,262
Held-to-maturity Securities, Fair Value	105,005,042	83,639,680
Fair Value		2,176,931
USTreasurySecurities1Member
Held-to-maturity Securities, Fair Value	52,080,292	52,250,079
US States and Political Subdivisions Debt Securities
Held-to-maturity Securities, Unrecognized Holding Loss	145,551	71,013
Held-to-maturity Securities, Fair Value	4,109,339	2,439,903
Corporate Debt Securities
Held-to-maturity Securities, Unrecognized Holding Loss	1,305,125	1,007,504
Held-to-maturity Securities, Fair Value	45,043,139	24,745,123
Collateralized Mortgage Backed Securities
Held-to-maturity Securities, Unrecognized Holding Loss	249,019	162,131
Held-to-maturity Securities, Fair Value	3,761,004	4,193,154
Redeemable Preferred Stock
Held-to-maturity Securities, Unrecognized Holding Loss	344	191
Held-to-maturity Securities, Fair Value	11,268	11,421
Industrial, miscellaneous and all other equity securities
Available-for-sale Debt Securities, Gross Unrealized Loss		632,669
Equity Securities
Available-for-sale Debt Securities, Gross Unrealized Loss		632,669
Less than 12 months
Held-to-maturity Securities, Unrecognized Holding Loss	1,643,530	757,039
Held-to-maturity Securities, Fair Value	88,667,957	65,901,527
Fair Value		847,718
Less than 12 months | USTreasurySecurities1Member
Held-to-maturity Securities, Unrecognized Holding Loss	897,420	532,010
Held-to-maturity Securities, Fair Value	51,456,932	51,606,699
Less than 12 months | US States and Political Subdivisions Debt Securities
Held-to-maturity Securities, Unrecognized Holding Loss	17,903	296
Held-to-maturity Securities, Fair Value	1,419,010	214,882
Less than 12 months | Corporate Debt Securities
Held-to-maturity Securities, Unrecognized Holding Loss	620,598	167,786
Held-to-maturity Securities, Fair Value	33,678,083	11,551,865
Less than 12 months | Collateralized Mortgage Backed Securities
Held-to-maturity Securities, Unrecognized Holding Loss	107,265	56,756
Held-to-maturity Securities, Fair Value	2,102,664	2,516,660
Less than 12 months | Redeemable Preferred Stock
Held-to-maturity Securities, Unrecognized Holding Loss	344	191
Held-to-maturity Securities, Fair Value	11,268	11,421
Less than 12 months | Industrial, miscellaneous and all other equity securities
Available-for-sale Debt Securities, Gross Unrealized Loss		$ 213,097
No. of Investment Positions		98
Less than 12 months | Equity Securities
Available-for-sale Debt Securities, Gross Unrealized Loss		$ 213,097
No. of Investment Positions		98
More than 12 months
Held-to-maturity Securities, Unrecognized Holding Loss	1,017,286	$ 1,063,223
Held-to-maturity Securities, Fair Value	16,337,085	17,738,153
Fair Value		1,329,213
More than 12 months | USTreasurySecurities1Member
Held-to-maturity Securities, Unrecognized Holding Loss	63,356	47,413
Held-to-maturity Securities, Fair Value	623,360	643,380
More than 12 months | US States and Political Subdivisions Debt Securities
Held-to-maturity Securities, Unrecognized Holding Loss	127,648	70,717
Held-to-maturity Securities, Fair Value	2,690,329	2,225,021
More than 12 months | Corporate Debt Securities
Held-to-maturity Securities, Unrecognized Holding Loss	684,528	839,718
Held-to-maturity Securities, Fair Value	11,365,056	13,193,258
More than 12 months | Collateralized Mortgage Backed Securities
Held-to-maturity Securities, Unrecognized Holding Loss	141,754	105,375
Held-to-maturity Securities, Fair Value	1,658,340	1,676,494
More than 12 months | Industrial, miscellaneous and all other equity securities
Available-for-sale Debt Securities, Gross Unrealized Loss		$ 419,572
No. of Investment Positions		81
More than 12 months | Equity Securities
Available-for-sale Debt Securities, Gross Unrealized Loss		$ 419,572
No. of Investment Positions		81
TotalMember
Held-to-maturity Securities, Unrecognized Holding Loss	2,660,816	$ 1,820,262
TotalMember | USTreasurySecurities1Member
Held-to-maturity Securities, Unrecognized Holding Loss	960,776	579,423
TotalMember | US States and Political Subdivisions Debt Securities
Held-to-maturity Securities, Unrecognized Holding Loss	145,551	71,013
TotalMember | Corporate Debt Securities
Held-to-maturity Securities, Unrecognized Holding Loss	1,305,126	1,007,504
TotalMember | Collateralized Mortgage Backed Securities
Held-to-maturity Securities, Unrecognized Holding Loss	249,019	162,131
TotalMember | Redeemable Preferred Stock
Held-to-maturity Securities, Unrecognized Holding Loss	$ 344	$ 191