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3) Investments: Schedule of Unrealized Loss on Investments (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value   $ 2,176,931
US Treasury Securities    
Held-to-maturity Securities, Unrecognized Holding Loss $ 1,248,029  
Debt Securities, Held-to-maturity, Fair Value 51,193,572 52,250,079
US States and Political Subdivisions Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 190,262  
Debt Securities, Held-to-maturity, Fair Value 5,091,997 2,439,903
Corporate Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 2,299,844  
Debt Securities, Held-to-maturity, Fair Value 68,898,393 24,745,123
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Held-to-maturity Securities, Unrecognized Holding Loss 323,564  
Debt Securities, Held-to-maturity, Fair Value 9,132,755 4,193,154
Total unrealized losses    
Debt Securities, Held-to-maturity, Fair Value 134,316,717 83,639,680
Redeemable Preferred Stock    
Held-to-maturity Securities, Unrecognized Holding Loss 0  
Debt Securities, Held-to-maturity, Fair Value   11,421
Industrial, miscellaneous and all other    
Debt Securities, Available-for-sale, Unrealized Loss   632,669
Equity Securities    
Debt Securities, Available-for-sale, Unrealized Loss   632,669
Less Than 12 Months | US Treasury Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 104,070 532,010
Debt Securities, Held-to-maturity, Fair Value 9,996,147 51,606,699
Less Than 12 Months | US States and Political Subdivisions Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 46,178 296
Debt Securities, Held-to-maturity, Fair Value 2,447,348 214,882
Less Than 12 Months | Corporate Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 1,738,234 167,786
Debt Securities, Held-to-maturity, Fair Value 59,982,599 11,551,865
Less Than 12 Months | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Held-to-maturity Securities, Unrecognized Holding Loss 51,253 56,756
Debt Securities, Held-to-maturity, Fair Value 6,780,302 2,516,660
Less Than 12 Months | Total unrealized losses    
Held-to-maturity Securities, Unrecognized Holding Loss 1,939,735 757,039
Debt Securities, Held-to-maturity, Fair Value 79,206,396 65,901,527
Less Than 12 Months | Redeemable Preferred Stock    
Held-to-maturity Securities, Unrecognized Holding Loss   191
Debt Securities, Held-to-maturity, Fair Value   11,421
Less Than 12 Months | Industrial, miscellaneous and all other    
Debt Securities, Available-for-sale, Unrealized Loss   $ 213,097
No. of Investment Positions   98
Less Than 12 Months | Equity Securities    
Debt Securities, Available-for-sale, Unrealized Loss   $ 213,097
No. of Investment Positions   98
More Than 12 Months    
Fair Value   $ 1,329,213
More Than 12 Months | US Treasury Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 1,143,956 47,413
Debt Securities, Held-to-maturity, Fair Value 41,197,425 643,380
More Than 12 Months | US States and Political Subdivisions Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 144,084 70,717
Debt Securities, Held-to-maturity, Fair Value 2,644,649 2,225,021
More Than 12 Months | Corporate Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 561,610 839,718
Debt Securities, Held-to-maturity, Fair Value 8,915,794 13,193,258
More Than 12 Months | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Held-to-maturity Securities, Unrecognized Holding Loss 272,311 105,375
Debt Securities, Held-to-maturity, Fair Value 2,352,453 1,676,494
More Than 12 Months | Total unrealized losses    
Held-to-maturity Securities, Unrecognized Holding Loss 2,121,961 1,063,223
Debt Securities, Held-to-maturity, Fair Value 55,110,321 17,738,153
More Than 12 Months | Redeemable Preferred Stock    
Held-to-maturity Securities, Unrecognized Holding Loss   0
Debt Securities, Held-to-maturity, Fair Value   0
More Than 12 Months | Industrial, miscellaneous and all other    
Debt Securities, Available-for-sale, Unrealized Loss   $ 419,572
No. of Investment Positions   81
More Than 12 Months | Equity Securities    
Debt Securities, Available-for-sale, Unrealized Loss   $ 419,572
No. of Investment Positions   81
Total    
Held-to-maturity Securities, Unrecognized Holding Loss 4,061,699  
Total | US Treasury Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 1,248,029 $ 579,423
Total | US States and Political Subdivisions Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 190,262 71,013
Total | Corporate Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 2,299,844 1,007,504
Total | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Held-to-maturity Securities, Unrecognized Holding Loss 323,564 162,131
Total | Total unrealized losses    
Held-to-maturity Securities, Unrecognized Holding Loss $ 4,061,699 1,820,262
Total | Redeemable Preferred Stock    
Held-to-maturity Securities, Unrecognized Holding Loss   $ 191