Annual report pursuant to Section 13 and 15(d)

Assets and Liabilities, at Fair Value - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Details)

v3.21.2
Assets and Liabilities, at Fair Value - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Jun. 30, 2020
Fair Value Disclosures [Abstract]    
Commemorative coin inventory, held at lower of cost or net realizable value $ 406 $ 17