Note 3 - Significant Accounting Policies (Details Textual)	12 Months Ended
May 31, 2026 USD ($) shares	May 31, 2025 USD ($) shares
Cash and Cash Equivalents, Maturity Period (Month)	3 months
Restricted Cash and Cash Equivalent, Current \| $	$ 3,365
Asset, Held-for-Sale, Not Part of Disposal Group \| $	$ 2,449,000	$ 5,800,000
Number of Operating Segments	4
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)	21,092	21,092
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 Call Options and Warrants (in shares)	7,583,186	2,132,358
Share-Based Payment Arrangement, Option [Member]
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares)	303,148	303,139
Warrants [Member]
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares)	0	620,900
Convertible Debentures [Member]
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares)	3,314,080	3,954,802
Fort Collins Facility [Member]
Asset, Held-for-Sale, Not Part of Disposal Group \| $	$ 2,449

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Amount of assets held-for-sale that are not part of a disposal group.

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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount of cash and cash equivalent restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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