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CONCENTRATIONS (Details)
$ in Millions
6 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
Dec. 31, 2023
USD ($)
Dec. 31, 2023
HKD ($)
Jun. 30, 2023
CNY (¥)
China          
CONCENTRATIONS          
Cash was on deposit at financial institutions ¥ 101,200,000   $ 14.3   ¥ 45,500,000
Maximum insured bank deposit | ¥ 500,000        
Unprotected cash held in banks 96,800,000   13.6   40,000,000.0
Hong Kong          
CONCENTRATIONS          
Cash was on deposit at financial institutions 154,600,000   21.8   240,300,000
Maximum insured bank deposit | $       $ 500,000  
Unprotected cash held in banks ¥ 152,900,000   $ 21.5   ¥ 238,800,000
China National Petroleum Corporation | Customer concentration | Sales revenue          
CONCENTRATIONS          
Concentration risk, percentage 56.00% 41.00%      
China National Petroleum Corporation | Customer concentration | Accounts Receivable          
CONCENTRATIONS          
Concentration risk, percentage 34.00% 43.00%      
SINOPEC | Customer concentration | Sales revenue          
CONCENTRATIONS          
Concentration risk, percentage 19.00% 31.00%      
SINOPEC | Customer concentration | Accounts Receivable          
CONCENTRATIONS          
Concentration risk, percentage 14.00% 18.00%      
CNOOC | Customer concentration | Sales revenue          
CONCENTRATIONS          
Concentration risk, percentage 15.00%        
CNOOC | Customer concentration | Accounts Receivable          
CONCENTRATIONS          
Concentration risk, percentage 21.00%        
Another Customer | Customer One | Accounts Receivable          
CONCENTRATIONS          
Concentration risk, percentage   14.00%      
Another Customer | Customer concentration | Sales revenue          
CONCENTRATIONS          
Concentration risk, percentage 10.00% 10.00%      
Another Customer | Customer concentration | Accounts Receivable          
CONCENTRATIONS          
Concentration risk, percentage 30.00%