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6. Investment at Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2020
Schedule of Investments [Abstract] |
Schedule of gain on investments |
|  | 2020 |  |  | 2019 |
|  | (In thousands) |
Change in fair value of investment, warrants |  | $ | 1,996 |  |  | $ | (1,308 | )
Change in fair value of investment, common stock |  |  | 3,478 |  |  |  | 11,207 |
Gain on sale of investment, warrants |  |  | 11,503 |  |  |  | – |
Loss on sale of investment, common stock |  |  | (3,316 | ) |  |  | (9,230 | )
Net realized and unrealized gain on investment at fair value |  | $ | 13,661 |  |  | $ | 669 |

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