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Schedule of stock option (Details) - $ / shares	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Equity [Abstract]
Beginning balance	1,446,400	1,596,499	1,912,940
Beginning balance	$ 8.27	$ 6.50	$ 6.20
Granted	578,000	447,500	370,000
Granted	$ 6.95	$ 13.30	$ 7,800
Exercised	(265,129)	(215)	(295,229)
Exercised	$ 4.99	$ 7.00	$ 6.10
Cancelled/expired	(217,771)	(392,446)	(391,212)
Cancelled/expired	$ 5.87	$ 7.70	$ 6.40
Exercised	265,129	215	295,229
Ending balance	1,541,500	1,446,400	1,596,499
Ending Balance	$ 9.64	$ 8.27	$ 6.50

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(03)
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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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