| Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
| | | | | | | | | | | Significant | | | Significant | |
| | | | | | | Quoted Prices in | | | Other Observable | | | Unobservable | |
| | | | | | | Active Markets | | | Inputs | | | Inputs | |
| Assets | | Fair Value | | | (Level 1) | | | (Level 2) | | | (Level 3) | |
| Investments-trading: | | | | | | | | | | | | | | | | |
| Corporate bonds and redeemable preferred stock | | $ | 18,449 | | | $ | - | | | $ | 18,449 | | | $ | - | |
| Derivatives | | | 4,651 | | | | - | | | | 4,651 | | | | - | |
| Equity securities | | | 10,424 | | | | 10,369 | | | | 55 | | | | - | |
| Municipal bonds | | | 3,813 | | | | - | | | | 3,813 | | | | - | |
| RMBS | | | 3 | | | | - | | | | 3 | | | | - | |
| SBA loans | | | 43,090 | | | | - | | | | 43,090 | | | | - | |
| U.S. government agency MBS and CMOs | | | 42,471 | | | | - | | | | 42,471 | | | | - | |
| U.S. government agency debt securities | | | 17,675 | | | | - | | | | 17,675 | | | | - | |
| Total investments - trading | | $ | 140,576 | | | $ | 10,369 | | | $ | 130,207 | | | $ | - | |
| | | | | | | | | | | | | | | | | |
| Other investments, at fair value: | | | | | | | | | | | | | | | | |
| Equity securities | | $ | 21,457 | | | | 19,831 | | | $ | 1,626 | | | $ | - | |
| Placement units and warrants | | | 19,997 | | | | - | | | | 19,997 | | | | - | |
| Corporate bonds and redeemable preferred stock | | | 535 | | | | - | | | | 535 | | | | - | |
| Notes receivable | | | 2,783 | | | | - | | | | 2,783 | | | | - | |
| | | | 44,772 | | | $ | 19,831 | | | $ | 24,941 | | | $ | - | |
| Investments measured at NAV (1) | | | 12,486 | | | | | | | | | | | | | |
| Total other investments, at fair value | | $ | 57,258 | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | |
| Liabilities | | | | | | | | | | | | | | | | |
| Trading securities sold, not yet purchased: | | | | | | | | | | | | | | | | |
| Corporate bonds and redeemable preferred stock | | $ | 8,107 | | | $ | - | | | $ | 8,107 | | | $ | - | |
| Derivatives | | | 4,245 | | | | - | | | | 4,245 | | | | - | |
| Equity securities | | | 463 | | | | 463 | | | | - | | | | - | |
| U.S. Treasury securities | | | 23,802 | | | | 23,802 | | | | - | | | | - | |
| Total trading securities sold, not yet purchased | | $ | 36,617 | | | $ | 24,265 | | | $ | 12,352 | | | $ | - | |
| | | | | | | | | | | | | | | | | |
| | | | | | | | | | | Significant | | | Significant | |
| | | | | | | Quoted Prices in | | | Other Observable | | | Unobservable | |
| | | | | | | Active Markets | | | Inputs | | | Inputs | |
| Assets | | Fair Value | | | (Level 1) | | | (Level 2) | | | (Level 3) | |
| Investments-trading: | | | | | | | | | | | | | | | | |
| Corporate bonds and redeemable preferred stock | | $ | 27,043 | | | $ | - | | | $ | 27,043 | | | $ | - | |
| Derivatives | | | 4,836 | | | | - | | | | 4,836 | | | | - | |
| Equity securities | | | 965 | | | | 352 | | | | 613 | | | | - | |
| Foreign government bond | | | 88 | | | | - | | | | 88 | | | | - | |
| Municipal bonds | | | 19,914 | | | | - | | | | 19,914 | | | | - | |
| RMBS | | | 5 | | | | - | | | | 5 | | | | - | |
| SBA loans | | | 28,328 | | | | - | | | | 28,328 | | | | - | |
| U.S. government agency MBS and CMOs | | | 45,911 | | | | - | | | | 45,911 | | | | - | |
| U.S. government agency debt securities | | | 21,242 | | | | - | | | | 21,242 | | | | - | |
| Total investments - trading | | $ | 148,332 | | | $ | 352 | | | $ | 147,980 | | | $ | - | |
| | | | | | | | | | | | | | | | | |
| Other investments, at fair value: | | | | | | | | | | | | | | | | |
| Equity securities | | $ | 11,072 | | | $ | 8,231 | | | $ | 2,841 | | | $ | - | |
| Placement units and warrants | | | 1,587 | | | | - | | | | 1,587 | | | | | |
| Corporate bonds and redeemable preferred stock | | | 531 | | | | - | | | | 531 | | | | - | |
| Notes receivable | | | 11,250 | | | | | | | | 11,250 | | | | | |
| Interests in SPVs | | | 1,565 | | | | | | | | 1,565 | | | | | |
| | | | 26,005 | | | $ | 8,231 | | | $ | 17,774 | | | $ | - | |
| Investments measured at NAV (1) | | | 9,257 | | | | | | | | | | | | | |
| Total other investments, at fair value | | $ | 35,262 | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | |
| Liabilities | | | | | | | | | | | | | | | | |
| Trading securities sold, not yet purchased: | | | | | | | | | | | | | | | | |
| Corporate bonds and redeemable preferred stock | | $ | 7,342 | | | $ | - | | | $ | 7,342 | | | $ | - | |
| Derivatives | | | 4,050 | | | | - | | | | 4,050 | | | | - | |
| Equity securities | | | 83 | | | | 83 | | | | - | | | | - | |
| U.S. government agency debt securities | | | 40 | | | | - | | | | 40 | | | | - | |
| U.S. Treasury securities | | | 24,917 | | | | 24,917 | | | | - | | | | - | |
| Total trading securities sold, not yet purchased | | $ | 36,432 | | | $ | 25,000 | | | $ | 11,432 | | | $ | - | |
| | | | | | | | | | | | | | | | | |
| Other investments, sold not yet purchased: | | | | | | | | | | | | | | | | |
| Equity securities | | $ | 1,181 | | | $ | 1,181 | | | $ | - | | | $ | - | |
| Share forward liabilities | | | 470 | | | | - | | | | 470 | | | | - | |
| Total other investments, sold not yet purchased | | $ | 1,651 | | | $ | 1,181 | | | $ | 470 | | | $ | - | |
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| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block] |
| | | December 31, 2025 | | | Unfunded Commitments | | | Redemption Frequency | | | Redemption Notice Period | |
| Other investments, at fair value | | | | | | | | | | | | | | | | |
| CK Capital Value Fund (a) | | $ | 1,171 | | | | N/A | | | | N/A | | | | N/A | |
| CREO JV (b) | | | 8,940 | | | $ | 7,268 | | | | N/A | | | | N/A | |
| U.S. Insurance JV (c) | | | 2,375 | | | | N/A | | | | N/A | | | | N/A | |
| | | $ | 12,486 | | | | | | | | | | | | | |
| | | December 31, 2024 | | | Unfunded Commitments | | | Redemption Frequency | | | Redemption Notice Period | |
| Other investments, at fair value | | | | | | | | | | | | | | | | |
| CREO JV (b) | | $ | 6,432 | | | $ | 10,118 | | | | N/A | | | | N/A | |
| U.S. Insurance JV (c) | | | 2,825 | | | | N/A | | | | N/A | | | | N/A | |
| | | $ | 9,257 | | | | | | | | | | | | | |
|