STOCKHOLDERS' EQUITY (Tables)

12 Months Ended

May 31, 2023

Stockholders' Equity Note [Abstract]

Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]

The amendments to the Canaccord Debentures and the U.S. Convertible Debenture were accounted for pursuant to Statement of Financial Accounting Standard ASC 820-10-35-37, Fair Value of Financial Instruments (“FAS 820”) and Statement of Financial Accounting Standards 815,  Accounting for Derivative Instruments and Hedging Activities (“FAS 815”).  The fair values of the warrants and conversion options were determined using a lattice model based on probability-weighted scenarios and future projections.  The following assumptions were used in valuing the Canaccord Debentures and the U.S. Convertible Debentures:

	Valuation Date	Volatility			Risk-Free Rate			High-Yield Cash Rate (less RFR)			Stock Price		Term Remaining (Years)
Canaccord Debentures – Pre-Mod	9/15/2022		164.5	%		3.54	%		11.03	%	$	0.28		0.24
Canaccord Debentures – Post-Mod	9/15/2022		125.2	%		3.57	%		11.03	%	$	0.28		2.29
U.S. Capital Debenture – Pre-Mod	9/15/2022		143.8	%		3.54	%		11.03	%	$	0.28		0.13
U.S. Capital Debentures – Post-Mod	9/15/2022		125.2	%		3.57	%		11.03	%	$	0.28		2.29

Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

The following table summarizes the significant terms of warrants outstanding at May 31, 2023. This table does not include the unit warrants. See Unit Warrants section below.

Range of exercise Prices		Number of warrants Outstanding		Weighted average remaining contractual life (years)		Weighted average exercise price of outstanding Warrants		Number of warrants Exercisable		Weighted average exercise price of exercisable Warrants
$	0.40		20,232,775		2.30	$	0.40		20,232,775	$	0.40
	1.60		191,094		2.30		1.60		191,094		1.60
	1.65		757,580		1.58		1.65		757,580		1.65
			21,181,449		2.27	$	0.46		21,181,449	$	0.46

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Transactions involving warrants are summarized as follows. This table does not include the unit warrants. See Unit Warrants section below.

	Number of Shares			Weighted Average Exercise Price
Warrants outstanding at May 31, 2021		13,499,411		$	2.12
Granted		874,666		$	1.65
Exercised		-		$	-
Cancelled / Expired		(12,644,153	)	$	2.09
Warrants outstanding at May 31, 2022		1,729,924		$	1.98
Granted		20,232,775		$	0.40
Exercised		-		$	-
Cancelled / Expired		(781,250	)	$	0.60
Warrants outstanding at May 31, 2023		21,181,449		$	0.46