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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Computation of basic and diluted earnings per share (Details) - USD ($)
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Numerator:      
Net income attributable to ordinary shareholders $ 3,152,868 $ 5,063,710 $ 5,332,318
Denominator:      
Weighted-average number of ordinary shares outstanding - basic 34,089,286 30,000,000 30,000,000
Outstanding warrants 300,000    
Weighted-average number of ordinary shares outstanding - diluted 34,089,286 30,000,000 30,000,000
Earnings per share - basic $ 0.09 $ 0.17 $ 0.18
Earnings per share - diluted $ 0.09 $ 0.17 $ 0.18
Underwriter warrants considered in diluted EPS calculation using treasury stock method 300,000    
Diluted shares 0 0 0