Note 13 - Warrant Liability (Details Textual) - $ / shares	Nov. 30, 2022	May 31, 2022
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	6,209,000	6,209,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 3.15	$ 5.95
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)	1
Percentage of Daily Cash Penalty	1.00%
Fair Value, Inputs, Level 3 [Member]
Estimated Fair Value of Warrant Liability Per Warrant (in dollars per share)	$ 2.04
Fair Value, Inputs, Level 3 [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0.0359
Fair Value, Inputs, Level 3 [Member] \| Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input	0.70
Fair Value, Inputs, Level 3 [Member] \| Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input	3.05
Fair Value, Inputs, Level 3 [Member] \| Measurement Input, Conversion Price [Member]
Warrants and Rights Outstanding, Measurement Input	3.15
Fair Value, Inputs, Level 3 [Member] \| Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input	3.87

The amount of estimated fair value of warrant liability per warrant.

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- Definition

The percentage of daily cash penalty.

+ References

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

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- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

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- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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