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Note 8 - Derivative Instruments (Tables) | 6 Months Ended
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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 | )

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- Definition Tabular disclosure of the presentation of foreign exchange contracts on the statement of financial position, including the fair value amounts and location of such amounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B + Details
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