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FINANCIAL RISK MANAGEMENT - Credit risk (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts receivables      
Credit risk      
Maximum exposure to credit risk $ 322,201 $ 597,505 $ 637,421
Trades accounts receivables 322,201 597,505 637,421
Accounts receivable write down 0 64,600 489,449
Accounts receivables | Overdue      
Credit risk      
Trades accounts receivables 146,658 148,815 311,642
Cash and cash equivalents, and restricted cash      
Credit risk      
Maximum exposure to credit risk $ 13,406,320 $ 5,755,707 $ 9,682,545