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DIVIDEND (Details) - USD ($)
12 Months Ended
Jul. 23, 2018
Jul. 19, 2018
Mar. 31, 2019
Common stock, dividends declared (in dollars per share) $ 0.40    
Aggregated dividend payments     $ 19,547,532
American depositary shares ("ADS")      
Common stock, dividends declared (in dollars per share) 0.40    
Annual dividend      
Common stock, dividends declared (in dollars per share) 0.27    
Annual dividend | American depositary shares ("ADS")      
Common stock, dividends declared (in dollars per share) 0.27    
Special cash dividend      
Common stock, dividends declared (in dollars per share) 0.13    
Special cash dividend | American depositary shares ("ADS")      
Common stock, dividends declared (in dollars per share) $ 0.13    
Minimum      
Percentage of dividend (in percentage)   15.00%  
Maximum      
Percentage of dividend (in percentage)   25.00%