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4. Fair Value Measurements (Details 1) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Hedge fund | $ 2,584,913 | $ 1,855,225
Total other investments | $ 2,584,913 | $ 1,855,225

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