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Note 4 - Discontinued Operations (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 | Mar. 31, 2026 | Dec. 31, 2025 | Apr. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Common stock, par value |  | $ 0.001 | $ 0.001 |
GT Medical Technologies, Inc. [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Percentage of issued and outstanding capital stock |  |  |  | 0.50%
GT Medical Technologies, Inc. [Member] | GT Medical Stock [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Estimated fair value |  | $ 0.2 |  |
GT Medical Technologies, Inc. [Member] | Royalty [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Royalties payable | $ 0.2 |  |  |

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