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Note 2 - Summary of Significant Accounting Policies - Schedule of Financial Instruments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Estimate of Fair Value Measurement [Member] |  |
Cash and restricted cash | $ 8,414 | $ 1,400
Cash equivalents | 11,363 | 23,429
Reported Value Measurement [Member] |  |
Cash and restricted cash | 8,414 | 1,400
Cash equivalents | 11,363 | 23,429
Fair Value, Inputs, Level 1 [Member] |  |
Cash and restricted cash | 8,414 | 1,400
Cash equivalents | 11,363 | 23,429
Fair Value, Inputs, Level 2 [Member] |  |
Cash and restricted cash | 0 | 0
Cash equivalents | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Cash and restricted cash | 0 | 0
Cash equivalents | $ 0 | $ 0

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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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