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Summary of Significant Accounting Policies - Exchange rates (Details)
12 Months Ended
Jun. 30, 2021
$ / $
€ / $
Jun. 30, 2020
$ / $
€ / $
Euro to US Dollar    
Period end exchange rate | € / $ 1.19 1.12
Average period exchange rate | € / $ 1.19 1.11
Mexican Peso to US Dollar    
Period end exchange rate | $ / $ 0.05 0.04
Average period exchange rate | $ / $ 0.05 0.05