Note 8 - Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2023

Table Text Block [Abstract]

Schedule of Foreign Exchange Contracts, Statement of Financial Position [Table Text Block]

As of June 30, 2023 and December 31, 2022, we recorded the following balances for the fair value of the contracts (in millions):

	June 30,		December 31,
Balance sheet line item:	2023		2022
Other current assets	$	3.4	$	1.1
Other non-current assets	$	2.0	$	0.4
Current derivative liabilities	$	1.4	$	4.0
Non-current derivative liabilities	$	0.8	$	3.6

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

The following tables summarize the quantities of metals committed under forward contracts at June 30, 2023 and December 31, 2022:

June 30, 2023	Ounces/pounds under contract (in 000's)								Average price per ounce/pound
	Silver		Gold		Zinc		Lead		Silver		Gold		Zinc		Lead
	(ounces)		(ounces)		(pounds)		(pounds)		(ounces)		(ounces)		(pounds)		(pounds)
Contracts on provisional sales
2023 settlements		1,845		7		1,709		8,433	$	24.35	$	1,946	$	1.31	$	1.00
Contracts on forecasted sales
2023 settlements		1,845		7		441		29,377	$	24.35	$	1,946	$	1.51	$	0.99
2024 settlements		—		—		—		75,178		—		—		—	$	0.98
2025 settlements		—		—		—		12,897	N/A		N/A		N/A		$	0.96

December 31, 2022	Ounces/pounds under contract (in 000's)								Average price per ounce/pound
	Silver		Gold		Zinc		Lead		Silver		Gold		Zinc		Lead
	(ounces)		(ounces)		(pounds)		(pounds)		(ounces)		(ounces)		(pounds)		(pounds)
Contracts on provisional sales
2023 settlements		3,124		8		18,629		11,960	$	21.55	$	1,795	$	1.38	$	0.98
Contracts on forecasted sales
2023 settlements		—		—		37,533		75,618	N/A		N/A		$	1.34	$	1.00
2024 settlements		—		—		—		45,856	N/A		N/A		N/A		$	0.99

Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]

We recorded the following balances for the fair value of the forward contracts as of June 30, 2023 and December 31, 2022 (in millions):

	June 30, 2023						December 31, 2022
Balance sheet line item:	Contracts in an asset position		Contracts in a liability position		Net asset (liability)		Contracts in an asset position		Contracts in a liability position			Net asset (liability)
Other current assets	$	7.3	$	—	$	7.3	$	1.2	$	—		$	1.2
Other non-current assets	$	1.4	$	—	$	1.4	$	0.1	$	—		$	0.1
Current derivative liabilities	$	—	$	—	$	—	$	—	$	(12.1	)	$	(12.1	)
Non-current derivative liabilities	$	—	$	—	$	—	$	—	$	(2.5	)	$	(2.5	)