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Note 11 - Fair Value Measurements - Range of Variables to Calculate Fair Value (Details) (Parentheticals) - USD ($) $ in Millions | Mar. 31, 2026 | Mar. 31, 2025
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Marathon SAFE Note Liability [Member] | Measurement Input, Discount Rate [Member] |  |
Present value | $ 12 | $ 12

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 + Details
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