Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Jun. 30, 2025
Summary Of Significant Accounting Policies [Line Items]
Metals purchase by customer maximum specified time period			1 year
Metal delivers to customer after receiving customers deposit based on prevailing current spot price percentage			110.00%
Unpriced metal is subject to margin call If deposit falls below percentage of value of unpriced metal			105.00%
Percentage to remit partial payment of total order price			20.00%
Amortization of debt issuance costs	$ 1,100	$ 1,000	$ 2,763	$ 1,680
Advertising costs	9,536	4,746	19,378	9,392
Cost of sales	$ 6,383,530	$ 2,697,578	$ 9,991,399	$ 5,369,231
Common stock, shares outstanding	24,896,992	23,019,185	24,896,992	23,019,185	24,639,386
Revenue From Contracts With Customers Percentage of Service Revenue	3.00%		3.00%
Revenue from contracts with customers amount of service revenue	$ 148,100		$ 270,500
Percentage of numismatic products revenue	99.00%		99.00%
Percentage of hammer price on auction transaction price			20.00%
Contract liabilities	$ 18,500		$ 18,500		$ 6,900
Antidilutive shares were excluded from the calculation	165,359	10,000	223,613	10,000
Shipping and Handling
Summary Of Significant Accounting Policies [Line Items]
Cost of sales	$ 11,200	$ 6,600	$ 18,400	$ 12,600
Minimum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of related assets	3 years		3 years
Estimated useful lives of intangibles	1 year		1 year
Threshold percentage for equity method investment	20.00%		20.00%
Maximum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of related assets	39 years		39 years
Estimated useful lives of intangibles	15 years		15 years
Threshold percentage for equity method investment	50.00%		50.00%
Customer locks period for purchase price			2 years