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Marketable securities in equity securities with readily determinable market prices consisted of the following as of June 30, 2021 and December 31, 2020: (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Cost | $ 4,040,000 | $ 199,000 |
Common Stock [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Cost | 24,262,000 |  | $ 1,506,000
Gross unrealized gains | 7,763,000 |  | 1,083,000
Gross unrealized losses | (1,853,000) |  | (26,000)
Fair value | $ 30,172,000 |  | $ 2,563,000

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