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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

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