13. Stock Option Plans: Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable (Details) - $ / shares	12 Months Ended
May 31, 2025	May 31, 2024
$ 9.01-$10.00
Number of Options	45,000	55,000
Weighted Average Remaining Years of Contractual Life	5 years 9 months 18 days	7 years
Weighted Average Exercise Price	$ 9.71	$ 9.67
$10.01-$11.00
Number of Options	15,250	15,250
Weighted Average Remaining Years of Contractual Life	3 years 8 months 12 days	4 years 8 months 12 days
Weighted Average Exercise Price	$ 10.21	$ 10.21
$11.01-$12.00
Number of Options	99,000	106,250
Weighted Average Remaining Years of Contractual Life	5 years 4 months 24 days	6 years 6 months
Weighted Average Exercise Price	$ 11.72	$ 11.72
$12.01-$13.00
Number of Options	6,000	19,000
Weighted Average Remaining Years of Contractual Life	1 year 8 months 12 days	1 year 6 months
Weighted Average Exercise Price	$ 12.41	$ 12.36
$13.01-$14.00
Number of Options	10,000	10,000
Weighted Average Remaining Years of Contractual Life	1 year 10 months 24 days	2 years 10 months 24 days
Weighted Average Exercise Price	$ 13.8	$ 13.8
$16.01-$17.00
Number of Options	10,000	10,000
Weighted Average Remaining Years of Contractual Life	10 months 24 days	1 year 10 months 24 days
Weighted Average Exercise Price	$ 16.4	$ 16.4
$19.01-$20.00
Number of Options	47,500	47,500
Weighted Average Remaining Years of Contractual Life	7 years 3 months 18 days	8 years 3 months 18 days
Weighted Average Exercise Price	$ 19.89	$ 19.89
$20.01-$21.00
Number of Options	33,750	34,500
Weighted Average Remaining Years of Contractual Life	8 years 4 months 24 days	9 years 4 months 24 days
Weighted Average Exercise Price	$ 20.78	$ 20.78
$30.01-$31.00
Number of Options	43,000
Weighted Average Remaining Years of Contractual Life	9 years 10 months 24 days
Weighted Average Exercise Price	$ 30.55
$43.01-$44.00
Number of Options	46,800
Weighted Average Remaining Years of Contractual Life	9 years 4 months 24 days
Weighted Average Exercise Price	$ 43.38
$46.01-$47.00
Number of Options	43,000	43,000
Weighted Average Remaining Years of Contractual Life	8 years 10 months 24 days	9 years 10 months 24 days
Weighted Average Exercise Price	$ 46.99	$ 46.99
$ 9.01-$47.00
Number of Options	399,300	340,500
Weighted Average Remaining Years of Contractual Life	6 years 10 months 24 days	6 years 10 months 24 days
Weighted Average Exercise Price	$ 22.89	$ 18.07

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Paragraph 2
-Section 50
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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