Note 7 - Financial Instruments (Tables)
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6 Months Ended |
Jun. 30, 2026 |
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| Notes Tables |
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| Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] |
| | | June 30, 2026 | | | December 31, 2025 | |
| Corporate bonds and redeemable preferred stock | | $ | 35,768 | | | $ | 18,449 | |
| Derivatives | | | 4,802 | | | | 4,651 | |
| Equity securities | | | 17,468 | | | | 10,424 | |
| Municipal bonds | | | 949 | | | | 3,813 | |
| RMBS | | | 3 | | | | 3 | |
| SBA loans | | | 34,710 | | | | 43,090 | |
| U.S. government agency MBS and CMOs | | | 59,248 | | | | 42,471 | |
| U.S. government agency debt securities | | | 20,116 | | | | 17,675 | |
| Investments-trading | | $ | 173,064 | | | $ | 140,576 | |
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| Security Sold Short [Table Text Block] |
| | | June 30, 2026 | | | December 31, 2025 | |
| Corporate bonds and redeemable preferred stock | | $ | 2,536 | | | $ | 8,107 | |
| Derivatives | | | 5,419 | | | | 4,245 | |
| Equity securities | | | 31 | | | | 463 | |
| U.S. government agency debt securities | | | 31 | | | | - | |
| U.S. Treasury securities | | | 40,915 | | | | 23,802 | |
| Trading securities sold, not yet purchased | | $ | 48,932 | | | $ | 36,617 | |
| | | June 30, 2026 | | | December 31, 2025 | |
| Equity derivatives | | $ | 80 | | | $ | - | |
| Other investments sold, not yet purchased, at fair value | | $ | 80 | | | $ | - | |
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| Schedule of Other Investments at Fair Value [Table Text Block] |
| Company Name | Ticker | | | June 30, 2026 | | | | December 31, 2025 | |
| CCM: | | | | | | | | | |
| Avax One Technology Ltd. | AVX | | $ | 390 | | | $ | 1,363 | |
| Bakkt, Inc. | BKKT | | | 976 | | | | - | |
| Critical Metals Corp. | CRML | | | 2,481 | | | | 1,506 | |
| Hadron Energy, Inc. | HDRN | | | 265 | | | | - | |
| Nakamoto Inc. | NAKA | | | - | | | | 1,802 | |
| Namib Minerals | NAMM | | | 1,082 | | | | 2,779 | |
| OceanPal Inc. | SVRN | | | - | | | | 2,930 | |
| ProCap Financial, Inc. | BRR | | | 647 | | | | 1,521 | |
| USBC, Inc. | USBC | | | - | | | | 2,482 | |
| Placement units/warrants, pre-M&A - | NA | | | 56,990 | | | | 18,492 | |
| Other equity instruments | NA | | | 331 | | | | 1,333 | |
| Subtotal CCM | NA | | | 63,162 | | | | 34,208 | |
| | | | | | | | | | |
| Non-CCM: | | | | | | | | | |
| Payoneer Global Inc. | PAYO | | | 1,997 | | | | - | |
| ProCap Financial, Inc. | BRR | | | 3,314 | | | | 7,595 | |
| Other equity instruments | NA | | | 1,007 | | | | 2,969 | |
| CK Capital Value Fund | NA | | | 1,417 | | | | 1,171 | |
| CREO JV | NA | | | 7,684 | | | | 8,940 | |
| U.S. Insurance JV | NA | | | 1,624 | | | | 2,375 | |
| Subtotal Non-CCM | | | 17,043 | | | | 23,050 | |
| | | | | | | | | | |
| Total Other Investments, at Fair Value | | $ | 80,205 | | | $ | 57,258 | |
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