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FINANCIAL INSTRUMENTS - RISK MANAGEMENT - Financial assets by category (Details) - USD ($)
Dec. 31, 2020
Jun. 30, 2020
Amortized cost    
Financial assets by category    
Financial assets. $ 99,177,202 $ 86,422,707
Fair value    
Financial assets by category    
Financial assets. 26,374,655 46,755,784
Cash and cash equivalents | Amortized cost    
Financial assets by category    
Financial assets. 4,633,470 4,813,012
Cash and cash equivalents | Fair value    
Financial assets by category    
Financial assets. 14,496,736 22,346,409
Other financial assets | Amortized cost    
Financial assets by category    
Financial assets. 5,382,974 4,713,161
Other financial assets | Fair value    
Financial assets by category    
Financial assets. 11,877,919 24,409,375
Trade receivables | Amortized cost    
Financial assets by category    
Financial assets. 84,945,171 73,546,633
Other receivables | Amortized cost    
Financial assets by category    
Financial assets. $ 4,215,587 $ 3,349,901