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10. Income taxes (Tables)
9 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]  
Provision for income tax expense
   March 31, 2021   March 31, 2020 
         
Current:          
Federal  $555,430   $212,722 
State   258,204    98,316 
Total current income tax provision  $813,634   $311,038 
Deferred:          
Federal   (36,221)    
State   (16,726)    
Total deferred taxes  $(52,947)  $ 
           
Total provision for income taxes  $760,686   $311,038 
Reconciliation of effective income tax rate
   March 31, 2021   March 31, 2020 
Statutory tax rate          
Federal   21.00%    21.00% 
State of California   8.84%    8.84% 
Net effect of state income tax deduction and other permanent differences   13.18%    1.79% 
Effective tax rate   43.02%    28.05%