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Marketable Securities - Schedule for Marketable Securities (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale securities: |  |
Amortized Cost | $ 13,257,000 | $ 22,992,000
Gross Unrealized Gain | 2,000 | 2,000
Gross Unrealized (Losses) | (223,000) | (715,000)
Estimated Fair Value | 13,036,000 | 22,279,000
Held-to-maturity securities: |  |
Amortized Cost |  | 0
Tax-exempt municipal securities |  |
Available-for-sale securities: |  |
Amortized Cost | 10,055,000 | 15,852,000
Gross Unrealized Gain | 2,000 | 2,000
Gross Unrealized (Losses) | (144,000) | (507,000)
Estimated Fair Value | 9,913,000 | 15,347,000
Corporate debt securities |  |
Available-for-sale securities: |  |
Amortized Cost | 3,202,000 | 7,140,000
Gross Unrealized Gain | 0 | 0
Gross Unrealized (Losses) | (79,000) | (208,000)
Estimated Fair Value | 3,123,000 | $ 6,932,000
Term deposits |  |
Held-to-maturity securities: |  |
Amortized Cost | 27,175,000 |
Gross Unrealized Gain | 0 |
Gross Unrealized (Losses) | 0 |
Estimated Fair Value | $ 27,175,000 |

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