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Note 9 - Convertible Notes (Details Textual) - Unsecured Convertible Notes [Member] $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Dec. 31, 2025 USD ($) shares | Mar. 31, 2026 USD ($) | Mar. 31, 2025 USD ($) | Mar. 24, 2024 USD ($) $ / shares
Debt Instrument, Face Amount | $ 175 |  |  | $ 525
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 0.00%
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  |  | $ 24.5
Long-Term Debt |  | $ 0 |  |
Amortization of Debt Issuance Costs and Discounts |  | $ 3 | $ 39 |
Conversion of Unsecured Convertible Notes To Common Stock [Member] |  |  |  |
Debt Conversion, Original Debt, Amount | $ 350 |  |  |
Debt Conversion, Converted Instrument, Shares Issued | shares | 14,286 |  |  |
Debt Instrument, Convertible, Number of Equity Instruments | 7,144 |  |  |

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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 + Details
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