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11. Earnings per share (Details) - USD ($)	3 Months Ended		6 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income	$ (206,823)	$ 220,724	$ 1,337,472	$ 577,222	$ 1,130,649	$ 797,946
Weighted-average shares used in computing basic and diluted earnings per share*	20,204,496	20,170,788			20,204,496	20,056,515
Earnings per share of ordinary shares: -basic and diluted	$ (0.010)	$ 0.011			$ 0.056	$ 0.040

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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