Note 3 - Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
May 31, 2025 USD ($) shares	May 31, 2024 USD ($) shares
Cash and Cash Equivalents, Maturity Period (Month)	3 months
Asset, Held-for-Sale, Not Part of Disposal Group \| $	$ 5,800	$ 32,074
Number of Operating Segments	4
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)	210,917	244,193
Stock Appreciation Rights (SARs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)	0
Restricted Stock Units (RSUs) [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares)	21,323,582	20,167,017
Share-Based Payment Arrangement, Option [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares)	3,031,385	4,425,383
Warrants [Member]
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares)	6,209,000	6,209,000
Convertible Debentures [Member]
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities (in shares)	39,548,019	65,001,591
Fort Collins Facility [Member]
Asset, Held-for-Sale, Not Part of Disposal Group \| $	$ 5,800

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