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FINANCIAL INSTRUMENTS - RISK MANAGEMENT - Fair value by hierarchy (Details) - USD ($)
Dec. 31, 2020
Jun. 30, 2020
Level 1    
Fair value by hierarchy    
Financial assets, at fair value $ 4,561,531  
Private warrants | Level 3    
Fair value by hierarchy    
Financial liabilities, at fair value   $ 1,686,643
Mutual funds | Level 1    
Fair value by hierarchy    
Financial assets, at fair value 14,496,736 22,346,409
Other financial assets | Level 1    
Fair value by hierarchy    
Financial assets, at fair value   16,640,965
US Treasury bills | Level 1    
Fair value by hierarchy    
Financial assets, at fair value $ 7,316,388 $ 7,768,410