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Note 4 - Fair Value Measurements - Reconciliation of Equity Securities (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
ONCO Series D Preferred Stock [Member] |  |
Balance | $ 1,764,318 | $ 0
Change in fair value of equity securities | 2,818,551 | 0
Converted into ONCO common stock | (3,218,257) | 0
Balance | 1,364,612 | 0
ONCO Warrant [Member] |  |
Balance | 760,987 | 0
Change in fair value of equity securities | 1,041,659 | 0
Balance | $ 1,802,646 | $ 0

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