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3) Investments: Schedule of Unrealized Loss on Investments (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
US Treasury Securities    
Held-to-maturity Securities, Unrecognized Holding Loss $ 456,728  
Debt Securities, Held-to-maturity, Fair Value 40,903,236 $ 40,625,915
US States and Political Subdivisions Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 55,394  
Debt Securities, Held-to-maturity, Fair Value 3,032,383 4,680,774
Corporate Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 1,445,027  
Debt Securities, Held-to-maturity, Fair Value 35,057,589 72,857,780
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Held-to-maturity Securities, Unrecognized Holding Loss 127,773  
Debt Securities, Held-to-maturity, Fair Value 2,194,397 4,395,361
Total unrealized losses    
Debt Securities, Held-to-maturity, Fair Value 81,187,605 122,649,830
Redeemable Preferred Stock    
Debt Securities, Held-to-maturity, Fair Value   90,000
Less Than 12 Months | US Treasury Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 767 10,519
Debt Securities, Held-to-maturity, Fair Value 495,115 695,863
Less Than 12 Months | US States and Political Subdivisions Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 0 6,643
Debt Securities, Held-to-maturity, Fair Value 0 1,791,257
Less Than 12 Months | Corporate Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 392,239 2,514,549
Debt Securities, Held-to-maturity, Fair Value 11,641,590 61,090,431
Less Than 12 Months | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Held-to-maturity Securities, Unrecognized Holding Loss 24,997 79,896
Debt Securities, Held-to-maturity, Fair Value 389,730 1,705,296
Less Than 12 Months | Total unrealized losses    
Held-to-maturity Securities, Unrecognized Holding Loss 418,003 2,616,732
Debt Securities, Held-to-maturity, Fair Value 12,526,435 65,372,847
Less Than 12 Months | Redeemable Preferred Stock    
Held-to-maturity Securities, Unrecognized Holding Loss   5,125
Debt Securities, Held-to-maturity, Fair Value   90,000
More Than 12 Months | US Treasury Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 455,961 717,279
Debt Securities, Held-to-maturity, Fair Value 40,408,121 39,930,052
More Than 12 Months | US States and Political Subdivisions Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 55,394 104,628
Debt Securities, Held-to-maturity, Fair Value 3,032,383 2,889,517
More Than 12 Months | Corporate Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 1,052,788 1,189,588
Debt Securities, Held-to-maturity, Fair Value 23,415,999 11,767,349
More Than 12 Months | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Held-to-maturity Securities, Unrecognized Holding Loss 102,776 228,968
Debt Securities, Held-to-maturity, Fair Value 1,804,667 2,690,065
More Than 12 Months | Total unrealized losses    
Held-to-maturity Securities, Unrecognized Holding Loss 1,666,919 2,240,463
Debt Securities, Held-to-maturity, Fair Value 68,661,170 57,276,983
More Than 12 Months | Redeemable Preferred Stock    
Held-to-maturity Securities, Unrecognized Holding Loss   0
Debt Securities, Held-to-maturity, Fair Value   0
Total    
Held-to-maturity Securities, Unrecognized Holding Loss 2,084,922  
Total | US Treasury Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 456,728 727,798
Total | US States and Political Subdivisions Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 55,394 111,271
Total | Corporate Debt Securities    
Held-to-maturity Securities, Unrecognized Holding Loss 1,445,027 3,704,137
Total | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Held-to-maturity Securities, Unrecognized Holding Loss 127,773 308,864
Total | Total unrealized losses    
Held-to-maturity Securities, Unrecognized Holding Loss $ 2,084,922 4,857,195
Total | Redeemable Preferred Stock    
Held-to-maturity Securities, Unrecognized Holding Loss   $ 5,125