FINANCIAL INSTRUMENTS - RISK MANAGEMENT - Currency risk (Details) - USD ($)
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
FINANCIAL INSTRUMENTS - RISK MANAGEMENT      
Risk exposure associated with instruments sharing characteristic $ (52,968,976) $ (40,513,954) $ (28,861,129)
Currency Risk | Amount expressed in USD      
FINANCIAL INSTRUMENTS - RISK MANAGEMENT      
Estimate of devaluation of Argentine peso (as a percent) 20.00%    
Result in pre-tax loss $ 10,600,000    
Estimate of appreciation of Argentine peso 20.00%    
Result in pre-tax gain $ 10,600,000