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Plant and equipment, net - Additional Information (Details)
12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2020
CNY (¥)
Jun. 30, 2020
USD ($)
Plant and equipment          
Property, Plant and Equipment, Net   $ 3,335,229     $ 3,455,993
Properties pledged as collateral       ¥ 36,626,600 5,200,000
Property pledged as collateral | Buildings | CQ Mingwen          
Plant and equipment          
Property, Plant and Equipment, Net       ¥ 12,268,800 1,700,000
Continuing operations          
Plant and equipment          
Depreciation $ 496,562 509,778 $ 529,442    
Property, Plant and Equipment, Net   3,335,229     3,455,993
Discontinued operations          
Plant and equipment          
Depreciation 125,257 167,609 $ 0    
Loss on disposal of long-lived assets 276,648        
Impairment of long-lived assets $ 724,987        
Property, Plant and Equipment, Net   $ 1,213,983     $ 25,752