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Note 2 - Going Concern (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
May 12, 2026 | Mar. 31, 2026 | Mar. 31, 2025 | May 06, 2026 | Dec. 31, 2025
Retained Earnings (Accumulated Deficit) |  | $ (113,619) |  |  | $ (111,615)
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation |  | (1,948) | $ (2,511) |  |
Private Placement [Member] |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  | $ 2,386 |  |  |
Private Placement [Member] | Subsequent Event [Member] |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ 8,000 |  |  |  |
May 2026 Securities Purchase Agreement [Member] | Subsequent Event [Member] |  |  |  |  |
Equity Offering, Maximum Amount |  |  |  | $ 1,000 |

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