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11. Earnings per share (Tables)
9 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Compution of earnings per share
   For the nine months ended
March 31,
 
   2021   2020 
Numerator:        
Net income  $1,130,649   $797,946 
Denominator:          
Weighted-average shares used in computing basic and diluted earnings per share*   20,204,496    20,056,515 
Earnings per share of ordinary shares: -basic and diluted  $0.056   $0.040