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Stock-based compensation (Details 4) - Non-Qualified Stock Options - September 2018
12 Months Ended
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected volatility 232.16%
Dividend yield 0.00%
Risk-free interest rate 2.39%
Expected life in years 3 years 6 months