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Note 8 - Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2024
Table Text Block [Abstract] |
Schedule of Foreign Exchange Contracts, Statement of Financial Position [Table Text Block] | As of March 31, 2024 and December 31, 2023, we recorded the following balances for the fair value of the foreign currency forward contracts (in millions):
|  | March 31, |  |  | December 31, |
Balance sheet line item: |  | 2024 |  |  | 2023 |
Other current assets |  | $ | 0.4 |  |  | $ | 2.7 |
Other non-current assets |  | $ | 0.3 |  |  | $ | 2.0 |
Other current liabilities |  | $ | (3.1 | ) |  | $ | (1.1 | )
Other non-current liabilities |  | $ | (1.2 | ) |  | $ | (0.4 | )
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | The following tables summarize the quantities of metals committed under forward metals contracts at March 31, 2024 and December 31, 2023:
March 31, 2024 |  | Ounces/pounds under contract (in 000's except gold) |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2024 settlements |  |  | 2,617 |  |  |  | 9,060 |  |  | - |  |  | 12,015 |  |  | $ | 24.81 |  |  | $ | 2,165 |  |  | N/A |  | $ | 0.98 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2024 settlements |  | - |  |  | - |  |  | - |  |  | 45,691 |  |  | N/A |  |  | N/A |  |  | N/A |  | $ | 0.98 |
2025 settlements |  | - |  |  | - |  |  | - |  |  | 43,541 |  |  | N/A |  |  | N/A |  |  | N/A |  | $ | 0.98 |
December 31, 2023 |  | Ounces/pounds under contract (in 000's except gold) |  |  | 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 |  |  | 735 |  |  |  | 3 |  |  |  | 441 |  |  |  | 15,542 |  |  | $ | 24.40 |  |  | $ | 2,045 |  |  | $ | 1.51 |  |  | $ | 1.00 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2024 settlements |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 56,713 |  |  | N/A |  |  | N/A |  |  | N/A |  |  | $ | 0.98 |
2025 settlements |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 49,273 |  |  | N/A |  |  | N/A |  |  | N/A |  |  | $ | 0.98 |
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 metals contracts as of March 31, 2024 and December 31, 2023 (in millions):
|  | March 31, 2024 |  |  | December 31, 2023 |
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 |  | $ | 2.4 |  |  | $ | — |  |  | $ | 2.4 |  |  | $ | 3.1 |  |  | $ | — |  |  | $ | 3.1 |
Other non-current assets |  | $ | 0.8 |  |  | $ | — |  |  | $ | 0.8 |  |  | $ | 1.5 |  |  | $ | — |  |  | $ | 1.5 |
Other current liabilities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (0.1 | ) |  | $ | (0.1 | )
Other non-current liabilities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of derivative instruments (including nonderivative instruments that are designated and qualify as hedging instruments) of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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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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