Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Details)

v3.21.2
Commitments and Contingencies - Additional Information (Details)
12 Months Ended
Jun. 30, 2021
USD ($)
oz
Jun. 30, 2020
USD ($)
Commitments And Contingencies Disclosure [Abstract]    
Maximum annual contributions per employee, percent 90.00%  
Employer matching contribution, percent of match, percentage 30.00%  
Employer matching contribution, percent of employees' gross pay, percentage 60.00%  
Automatic default contribution for newly eligible employees percent of deducted pre-tax from employees pay 3.00%  
Employees eligible period 21 years  
Employer contribution | $ $ 382,000 $ 276,000
Refined silver leased under supplier agreement | oz 100,000