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Schedule of Realized Gain (loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Investments [Abstract] |  |  |
Sales proceeds | $ 16,623 | $ 61,163 | $ 15,318
Realized gains | 1,138 | 2,449 | 2
Realized losses |  | (1) | (179)
Net realized gains | $ 1,138 | $ 2,448 | $ (177)

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