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Commitments and contingencies (Details - Rent commencement)
 6 Months Ended
Dec. 31, 2021
USD ($)
1-12 Months [Member]  
Description of price per square foot per month 1.15 per square foot per month
Monthly base rent $ 114,249
13-24 Months [Member]  
Description of price per square foot per month 1.19 per square foot per month
Monthly base rent $ 118,222
25-36 Months [Member]  
Description of price per square foot per month 1.23 per square foot per month
Monthly base rent $ 122,196
37-48 Months [Member]  
Description of price per square foot per month 1.27 per square foot per month
Monthly base rent $ 126,170
49-60 Months [Member]  
Description of price per square foot per month 1.31 per square foot per month
Monthly base rent $ 130,144
61-62 Months [Member]  
Description of price per square foot per month 1.36 per square foot per month
Monthly base rent $ 135,111