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Marketable Securities (Details - Marketable Securities) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Marketable Securities [Line Items] |  |  |  |
Adjusted Cost | $ 80,902,119 |  | $ 80,902,119 |
Unrealized Loss | (509,625) | $ 0 | (509,625) | $ 0
Fair Value | 80,392,494 |  | 80,392,494 |
Corporate Bond Securities [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Adjusted Cost | 45,625,483 |  | 45,625,483 |
Unrealized Loss |  |  | (371,032) |
Fair Value | 45,254,451 |  | 45,254,451 |
US Treasury Securities [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Adjusted Cost | 5,997,340 |  | 5,997,340 |
Unrealized Loss |  |  | (32,998) |
Fair Value | 5,964,342 |  | 5,964,342 |
U S Agency And Government Sponsored Securities [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Adjusted Cost | 5,300,463 |  | 5,300,463 |
Unrealized Loss |  |  | (6,186) |
Fair Value | 5,294,277 |  | 5,294,277 |
US Treasury Notes Securities [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Adjusted Cost | 11,231,747 |  | 11,231,747 |
Unrealized Loss |  |  | (81,470) |
Fair Value | 11,150,277 |  | 11,150,277 |
Asset-backed Securities [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Adjusted Cost | 12,747,086 |  | 12,747,086 |
Unrealized Loss |  |  | (17,939) |
Fair Value | $ 12,729,147 |  | $ 12,729,147 |

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