Note 9 - Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2022

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:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2022			2021			2022			2021
(Loss) gain on derivative contracts	$	873		$	12,148		$	(20)		$	(4,692	)
Unrealized loss on investments in equity securities		(5,110	)		(2,861	)		(14,749	)		(7,117	)
(Loss) gain on disposition or exchange of investments		(3	)		—			66			1,158
Total fair value adjustments, net	$	(4,240	)	$	9,287		$	(14,703	)	$	(10,651	)

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 September 30, 2022		Balance at December 31, 2021		Input Hierarchy Level
Assets:
Cash and cash equivalents:
Money market funds and other bank deposits	$	144,669	$	210,010		Level 1
Current and non-current investments
Equity securities		13,299		14,470		Level 1
Trade accounts receivable:
Receivables from provisional concentrate sales		12,477		36,437		Level 2
Restricted cash balances:
Certificates of deposit and other deposits		1,246		1,053		Level 1
Derivative contracts – current and non-current derivatives assets:
Foreign exchange contracts		591		5,207		Level 2
Metal forward and put option contracts		27,393		—		Level 2
Total assets	$	199,675	$	267,177
Liabilities:
Derivative contracts – current derivatives liabilities and other non-current liabilities:
Foreign exchange contracts	$	11,334	$	8		Level 2
Metal forward and put option contracts		—		37,873		Level 2
Total liabilities	$	11,334	$	37,881