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Investments (Trading Securities FV) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Investment balances |  |  |
Cost | $ 25,232 | $ 32,717 |
Gross Unrealized Gains | 824 | 320 |
Gross Unrealized Losses | (308) | (363) |
Investments in trading securities | 25,748 | 32,674 |
Trading Securities, Unrealized Holding Gain | 824 | 320 |
Trading Securities, Unrealized Holding Loss | 308 | 363 |
Trading Securities, Cost | 25,232 | 32,717 |
Investment Owned, at Cost | 26,788 | 32,982 |
Investments in trading securities | 25,748 | 32,674 |
Unrealized Gain on Securities | 1,226 | 327 |
Unrealized Loss on Securities | (320) | (394) |
Investment Owned, at Fair Value | 27,694 | 32,915 |
Unrealized Gain (Loss) on Investments | 0 | 6 | $ (1,495)
U.S. Government securities |  |  |
Investment balances |  |  |
Cost | 15,859 | 22,522 |
Gross Unrealized Gains | 263 | 14 |
Gross Unrealized Losses | (66) | (75) |
Investments in trading securities | 16,056 | 22,461 |
Trading Securities, Unrealized Holding Gain | 263 | 14 |
Trading Securities, Unrealized Holding Loss | 66 | 75 |
Trading Securities, Cost | 15,859 | 22,522 |
Investments in trading securities | 16,056 | 22,461 |
Money market funds |  |  |
Investment balances |  |  |
Cost | 7,629 | 5,367 |
Gross Unrealized Gains | 174 | 111 |
Gross Unrealized Losses | 0 | 0 |
Investments in trading securities | 7,803 | 5,478 |
Trading Securities, Unrealized Holding Gain | 174 | 111 |
Trading Securities, Unrealized Holding Loss | 0 | 0 |
Trading Securities, Cost | 7,629 | 5,367 |
Investments in trading securities | 7,803 | 5,478 |
Equity funds |  |  |
Investment balances |  |  |
Cost | 1,432 | 4,295 |
Gross Unrealized Gains | 318 | 195 |
Gross Unrealized Losses | (132) | (260) |
Investments in trading securities | 1,618 | 4,230 |
Trading Securities, Unrealized Holding Gain | 318 | 195 |
Trading Securities, Unrealized Holding Loss | 132 | 260 |
Trading Securities, Cost | 1,432 | 4,295 |
Investments in trading securities | 1,618 | 4,230 |
Private investment fund |  |  |
Investment balances |  |  |
Investment Owned, at Cost | 1,556 | 265 |
Unrealized Gain on Securities | 402 | 7 |
Unrealized Loss on Securities | (12) | (31) |
Investment Owned, at Fair Value | 1,946 | 241 |
Equity Securities |  |  |
Investment balances |  |  |
Cost |  | 381 |
Gross Unrealized Gains |  | 0 |
Gross Unrealized Losses |  | (24) |
Investments in trading securities |  | 357 |
Trading Securities, Unrealized Holding Gain |  | 0 |
Trading Securities, Unrealized Holding Loss |  | 24 |
Trading Securities, Cost |  | 381 |
Investments in trading securities |  | 357 |
Debt Securities, Trading, Amortized Cost | 183 |  |
Debt Securities, Trading, Unrealized Gain | 69 |  |
Debt Securities, Trading, Unrealized Loss | (108) |  |
Debt Securities, Trading | 144 |  |
us-gaap_EquitySecuritiesMember |  |  |
Investment balances |  |  |
Debt Securities, Trading, Amortized Cost | 129 | 152 |
Debt Securities, Trading, Unrealized Gain | 0 | 0 |
Debt Securities, Trading, Unrealized Loss | (2) | (4) |
Debt Securities, Trading | $ 127 | $ 148 |

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