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INFORMATION ABOUT COMPONENTS OF CONSOLIDATED STATEMENTS OF FINANCIAL POSITION - Deferred revenue and advances from customers (Details) - USD ($)
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
INFORMATION ABOUT COMPONENTS OF CONSOLIDATED STATEMENTS OF FINANCIAL POSITION      
Advances from customers $ 6,277,313 $ 2,865,437 $ 1,074,463
Deferred revenue and advances from customers $ 6,277,313 $ 2,865,437 $ 1,074,463