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Note 9 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2023 | Sep. 30, 2019 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Government Assistance, Amount |  |  | $ 286 | $ 314 |
Grant Funding Related to VISIONARY-MS Phase 2 Clinical Trial [Member] | National Multiple Sclerosis Society [Member] |  |  |  |  |
Government Assistance, Amount |  | $ 300 |  |  |
Government Assistance, Repayment, Percentage of Grant Funding Upon First Commercial Product Sale |  | 50.00% |  |  |
Government Assistance, Repayment, Additional Percentage of Grant Funding, Tranche One |  | 50.00% |  |  |
Government Assistance, Repayment, Cumulative Sales, Tranche One |  | $ 10,000 |  |  |
Government Assistance, Repayment, Cumulative Sales, Tranche Two |  | $ 50,000 |  |  |
Government Assistance, Repayment, Additional Percentage of Grant Funding, Tranche Three |  | 200.00% |  |  |
Government Assistance, Repayment, Cumulative Sales, Tranche Three |  | $ 100,000 |  |  |
Government Assistance, Repayment, Maximum Percentage of Grant Funding When All Milestones Achieved |  | 450.00% |  |  |
Government Assistance, Aggregate Repayment, Percentage of Grant Funding |  | 300.00% |  |  |
Government Assistance, Repayment, Percentage of Grant Funding Upon Closing |  | 300.00% |  |  |
Government Assistance, Repayment Amount Upon Closing |  | $ 1,000 |  |  |
Grant Funding Related to VISIONARY-MS Phase 2 Clinical Trial [Member] | National Multiple Sclerosis Society [Member] | Minimum [Member] |  |  |  |  |
Government Assistance, Possible Loss, Percentage of Grant Funding |  | 50.00% |  |  |
Government Assistance, Possible Loss Between Minimum and Maximum Repayment Amounts |  | $ 200 |  |  |
Grant Funding Related to VISIONARY-MS Phase 2 Clinical Trial [Member] | National Multiple Sclerosis Society [Member] | Maximum [Member] |  |  |  |  |
Government Assistance, Possible Loss, Percentage of Grant Funding |  | 450.00% |  |  |
Government Assistance, Possible Loss Between Minimum and Maximum Repayment Amounts |  | $ 1,500 |  |  |
Grant Funding Related to REPAIR-MS Phase 2 Clinical Trial [Member] | National Multiple Sclerosis Society [Member] |  |  |  |  |
Government Assistance, Amount | $ 700 |  |  |  |
Government Assistance, Repayment, Additional Percentage of Grant Funding, Tranche Two |  | 150.00% |  |  |
Government Assistance, Aggregate Repayment, Percentage of Grant Funding | 150.00% |  |  |  |
Government Assistance, Repayment, Percentage of Grant Funding Upon Closing | 150.00% |  |  |  |
Government Assistance, Repayment Amount Upon Closing | $ 1,000 |  |  |  |
Grant Funding Related to REPAIR-MS Phase 2 Clinical Trial [Member] | National Multiple Sclerosis Society [Member] | Minimum [Member] |  |  |  |  |
Government Assistance, Possible Loss Between Minimum and Maximum Repayment Amounts | 300 |  |  |  |
Grant Funding Related to REPAIR-MS Phase 2 Clinical Trial [Member] | National Multiple Sclerosis Society [Member] | Maximum [Member] |  |  |  |  |
Government Assistance, Possible Loss Between Minimum and Maximum Repayment Amounts | $ 3,000 |  |  |  |
Capital Addition Purchase Commitments [Member] |  |  |  |  |
Long-Term Purchase Commitment, Amount |  |  | $ 200 |  | $ 400

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- Definition Amount of increase (decrease) in income from government assistance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 832 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483507/832-10-50-3 + Details
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