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3. Investments (Details 4) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized cost | $ 3,824,620 | $ 4,222,855
Estimated fair value | 4,114,072 | 4,426,416
Less Than One Year [Member] |  |
Amortized cost | 0 | 0
Estimated fair value | 0 | 0
One To Five Years [Member] |  |
Amortized cost | 2,598,323 | 2,996,685
Estimated fair value | 2,705,549 | 3,036,531
Five To Ten Years [Member] |  |
Amortized cost | 619,780 | 619,663
Estimated fair value | 654,484 | 635,846
More Than 10 Years [Member] |  |
Amortized cost | 606,517 | 606,507
Estimated fair value | $ 754,039 | $ 754,039

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