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3. Investments (Details 4) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost | $ 3,826,404 | $ 3,825,952
Estimated fair value | 4,136,710 | 4,124,767
Less Than One Year |  |
Amortized cost | 500,000 | 500,000
Estimated fair value | 497,770 | 499,165
One To Five Years |  |
Amortized cost | 2,099,588 | 2,099,268
Estimated fair value | 2,220,096 | 2,215,640
Five To Ten Years |  |
Amortized cost | 620,255 | 620,134
Estimated fair value | 664,805 | 655,923
More Than 10 Years |  |
Amortized cost | 606,561 | 606,550
Estimated fair value | $ 754,039 | $ 754,039

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