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10. Income taxes (Details - Provision for income taxes) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Income Tax Disclosure [Abstract]        
Current federal tax expense     $ 555,430 $ 212,722
Current state tax expense     258,204 98,316
Total current income tax provision     813,634 311,038
Federal deferred tax expense     (36,221) 0
State deferred tax expense     (16,726) 0
Total deferred tax assets     (52,947) 0
Total income tax liability $ 237,813 $ 86,085 $ 760,687 $ 311,038