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Investments (Trading Securities FV) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investment balances |  |  |
Cost | $ 32,717 | $ 16,121 |
Gross Unrealized Gains | 320 | 143 |
Gross Unrealized Losses | (363) | (922) |
Investments in trading securities | 32,674 | 15,342 |
Trading Securities, Unrealized Holding Gain | 320 | 143 |
Trading Securities, Unrealized Holding Loss | 363 | 922 |
Trading Securities, Cost | 32,717 | 16,121 |
Investment Owned, at Cost | 32,982 | 19,861 |
Investments in trading securities | 32,674 | 15,342 |
Unrealized Gain on Securities | 327 | 143 |
Unrealized Loss on Securities | (394) | (1,635) |
Investment Owned, at Fair Value | 32,915 | 18,369 |
Unrealized Gain (Loss) on Investments | 6 | (1,495) | $ (1,797)
U.S. Government securities |  |  |
Investment balances |  |  |
Cost | 22,522 | 5,728 |
Gross Unrealized Gains | 14 | 0 |
Gross Unrealized Losses | (75) | (389) |
Investments in trading securities | 22,461 | 5,339 |
Trading Securities, Unrealized Holding Gain | 14 | 0 |
Trading Securities, Unrealized Holding Loss | 75 | 389 |
Trading Securities, Cost | 22,522 | 5,728 |
Investments in trading securities | 22,461 | 5,339 |
Money market funds |  |  |
Investment balances |  |  |
Cost | 5,367 | 4,093 |
Gross Unrealized Gains | 111 | 111 |
Gross Unrealized Losses | 0 | 0 |
Investments in trading securities | 5,478 | 4,204 |
Trading Securities, Unrealized Holding Gain | 111 | 111 |
Trading Securities, Unrealized Holding Loss | 0 | 0 |
Trading Securities, Cost | 5,367 | 4,093 |
Investments in trading securities | 5,478 | 4,204 |
Equity funds |  |  |
Investment balances |  |  |
Cost | 4,295 | 4,863 |
Gross Unrealized Gains | 195 | 32 |
Gross Unrealized Losses | (260) | (446) |
Investments in trading securities | 4,230 | 4,449 |
Trading Securities, Unrealized Holding Gain | 195 | 32 |
Trading Securities, Unrealized Holding Loss | 260 | 446 |
Trading Securities, Cost | 4,295 | 4,863 |
Investments in trading securities | 4,230 | 4,449 |
Private investment fund |  |  |
Investment balances |  |  |
Investment Owned, at Cost | 265 | 265 |
Unrealized Gain on Securities | 7 | 0 |
Unrealized Loss on Securities | (31) | (30) |
Investment Owned, at Fair Value | 241 | 235 |
Private equity |  |  |
Investment balances |  |  |
Gross Unrealized Losses |  | (683) |
Trading Securities, Unrealized Holding Loss |  | 683 |
Investment Owned, at Cost |  | 3,475 |
Unrealized Gain on Securities |  | 0 |
Investment Owned, at Fair Value |  | 2,792 |
Equity Securities |  |  |
Investment balances |  |  |
Cost |  | 1,278 |
Gross Unrealized Gains |  | 0 |
Gross Unrealized Losses |  | (65) |
Investments in trading securities |  | 1,213 |
Trading Securities, Unrealized Holding Gain |  | 0 |
Trading Securities, Unrealized Holding Loss |  | 65 |
Trading Securities, Cost |  | 1,278 |
Investments in trading securities |  | 1,213 |
Debt Securities, Trading, Amortized Cost | 381 |  |
Debt Securities, Trading, Unrealized Gain | 0 |  |
Debt Securities, Trading, Unrealized Loss | (24) |  |
Debt Securities, Trading | 357 |  |
us-gaap_EquitySecuritiesMember |  |  |
Investment balances |  |  |
Debt Securities, Trading, Amortized Cost | 152 | 159 |
Debt Securities, Trading, Unrealized Gain | 0 | 0 |
Debt Securities, Trading, Unrealized Loss | (4) | (22) |
Debt Securities, Trading | $ 148 | $ 137 |

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