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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