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INTANGIBLE ASSETS, NET - Estimated future amortization expense (Details) - USD ($)
Sep. 30, 2020
Sep. 30, 2019
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2021 $ 58,554  
2022 56,942  
2023 54,721  
2024 52,326  
2025 52,326  
Thereafter 1,606,853  
Intangible assets, net $ 1,881,722 $ 1,834,130