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Variable interest entity (Details - VIE operations) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Revenue $ 16,569,678 $ 23,308,508 $ 54,650,770 $ 66,617,004
Variable Interest Entity, Primary Beneficiary [Member]        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Revenue 0 0 0 0
Net income (loss) after elimination of intercompany transactions $ (485,078) $ 63,898 $ (669,296) $ (327,984)