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FINANCIAL INSTRUMENTS - RISK MANAGEMENT - Financial assets by category (Details) - USD ($)
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Amortized cost      
Financial assets by category      
Financial assets. $ 123,776,201 $ 101,786,147 $ 68,957,670
Fair value      
Financial assets by category      
Financial assets. 18,453,966 31,392,344 356,233
Cash and cash equivalents | Amortized cost      
Financial assets by category      
Financial assets. 28,327,569 20,176,452 3,450,873
Cash and cash equivalents | Fair value      
Financial assets by category      
Financial assets. 7,718,544 22,346,409  
Other financial assets | Amortized cost      
Financial assets by category      
Financial assets. 1,523,438 4,713,161 4,703,688
Other financial assets | Fair value      
Financial assets by category      
Financial assets. 10,735,422 9,045,935 356,233
Trade receivables | Amortized cost      
Financial assets by category      
Financial assets. 88,919,911 73,546,633 59,236,377
Other receivables | Amortized cost      
Financial assets by category      
Financial assets. $ 5,005,283 $ 3,349,901 $ 1,566,732