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

Fair value of the assets less the liabilities of a derivative or group of derivatives.

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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant