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FINANCIAL INSTRUMENTS - RISK MANAGEMENT - Financial assets by category (Details) - USD ($)
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Amortized cost.      
Financial assets by category      
Financial assets. $ 153,393,279 $ 123,776,201 $ 101,786,147
Fair value      
Financial assets by category      
Financial assets. 5,698,390 18,453,966 31,392,344
Cash and cash equivalents. | Amortized cost.      
Financial assets by category      
Financial assets. 32,912,886 28,327,569 20,176,452
Cash and cash equivalents. | Fair value      
Financial assets by category      
Financial assets. 562,380 7,718,544 22,346,409
Other financial assets | Amortized cost.      
Financial assets by category      
Financial assets. 884,964 1,523,438 4,713,161
Other financial assets | Fair value      
Financial assets by category      
Financial assets. 5,136,010 10,735,422 9,045,935
Trade receivables | Amortized cost.      
Financial assets by category      
Financial assets. 111,952,722 88,919,911 73,546,633
Other receivables. | Amortized cost.      
Financial assets by category      
Financial assets. $ 7,642,707 $ 5,005,283 $ 3,349,901