Note 4 - Investments - Securities Owned and Other Investments Not Readily Marketable Disclosure (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Security Owned Not Readily Marketable, Fair Value | $ 1,968 | $ 0 |
| Security Owned Not Readily Marketable, Fair Value, Percentage of Total | 100.00% | 0.00% |
| Convertible Promissory Note Receivable [Member] | ||
| Security Owned Not Readily Marketable, Fair Value | $ 1,968 | $ 0 |
| Security Owned Not Readily Marketable, Fair Value, Percentage of Total | 100.00% | 0.00% |