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Note 1 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - shares
3 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities (in shares) 37,664,780 64,971,746
Restricted Stock Units (RSUs) [Member]    
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares) 52,107,218 23,411,577
Share-Based Payment Arrangement, Option [Member]    
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares) 3,032,011 3,359,144
Warrants [Member]    
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares) 6,209,000 6,209,000