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Income taxes (Tables)
6 Months Ended
Dec. 31, 2021
Income Tax Disclosure [Abstract]  
Schedule of provision for income tax expense
                    
   Three Months Ended December 31,   Six Months Ended December 31, 
   2021   2020   2021   2020 
Current:                    
Federal  $222,339   $155,348   $456,968   $357,351 
States   100,376    71,582    208,722    165,523 
Total current income tax provision   322,715    226,930    665,690    522,874 
Deferred:                    
Federal                
States                
Total deferred taxes                
                     
Total provision for income taxes  $322,715   $226,930   $665,690   $522,874 
Schedule of reconciliation of effective income tax rate
                    
   Three Months Ended December 31,   Six Months Ended December 31, 
   2021   2020   2021   2020 
Statutory tax rate                    
Federal   21.00%    21.00%    21.00%    21.00% 
State    8.84%    8.84%    8.84%    8.84% 
Net effect of state income tax deduction and other permanent differences   (1.04%)   (1.56%)    (1.53%)    (1.74%) 
                     
Effective tax rate   28.80%    28.28%    28.31%    28.10%