Note 9 - Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 2024

Table Text Block [Abstract]

Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block]

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

	Three Months Ended March 31,
	2024			2023
(Loss) gain on derivative contracts	$	(1,899	)	$	987
Unrealized gain (loss) on equity securities investments		47			2,194
Total fair value adjustments, net	$	(1,852	)	$	3,181

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The table below sets forth our assets and liabilities 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 (in thousands).

Description	Balance at March 31, 2024		Balance at December 31, 2023		Input Hierarchy Level
Assets:
Cash and cash equivalents:
Money market funds and other bank deposits	$	80,169	$	106,374	Level 1
Current and non-current investments:
Equity securities		32,873		32,284	Level 1
Trade accounts receivable:
Receivables from provisional concentrate sales		30,508		14,740	Level 2
Restricted cash and cash equivalent balances:
Certificates of deposit and other deposits		1,163		1,165	Level 1
Derivative contracts - current and non-current derivative assets:
Foreign exchange contracts		685		4,657	Level 2
Metal forward contracts		3,246		4,698	Level 2
Total assets	$	148,644	$	163,918
Liabilities:
Derivative contracts - current and non-current derivative liabilities:
Foreign exchange contracts	$	4,267	$	1,508	Level 2
Metal forward contracts		—		40	Level 2
Total liabilities	$	4,267	$	1,548