Note 11 - Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings

Fair value adjustments, net is comprised of the following (in thousands):

	Year Ended December 31,
	2024			2023			2022
Loss (gain) on derivative contracts	$	(5,907	)	$	3,168		$	844
Unrealized gain (loss) on investments in equity securities		3,703			(243	)		(5,632	)
Gain on disposition or exchange of investments		—			—			65
Total fair value adjustments, net	$	(2,204	)	$	2,925		$	(4,723	)

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The table below sets forth our assets and liabilities (in thousands) that were accounted for at fair value on a recurring basis and the fair value calculation input hierarchy level that we have determined applies to each asset and liability category. See Note 6 for information on the fair values of our defined benefit pension plan assets.

	Balance at December 31, 2024		Balance at December 31, 2023		Input Hierarchy Level
Assets:
Cash and cash equivalents:
Money market funds and other bank deposits	$	26,868	$	106,374	Level 1
Current and non-current investments:
Equity securities		33,158		32,284	Level 1
Trade accounts receivable:
Receivables from provisional concentrate sales		31,515		17,940	Level 2
Derivative contracts - other current assets and other non-current assets:
Metal forward contracts		18,039		4,698	Level 2
Foreign exchange contracts		—		4,657	Level 2
Restricted cash and cash equivalents balances:
Certificates of deposit and other deposits		1,177		1,165	Level 1
Liabilities
Derivative contracts - current and non-current derivative liabilities:
Metal forward contracts	$	—	$	40	Level 2
Foreign exchange contracts		10,176		1,508	Level 2