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Note 8 - Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2022
Notes Tables |
Schedule of Foreign Exchange Contracts, Statement of Financial Position [Table Text Block] |
|  | March 31, |  |  | December 31, |
Balance sheet line item: |  | 2022 |  |  | 2021 |
Other current assets |  | $ | 3.9 |  |  | $ | 2.7 |
Other non-current assets |  |  | 3.9 |  |  |  | 2.5 |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
March 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 settlements |  |  | 1,573 |  |  |  | 5 |  |  |  | 16,976 |  |  |  | 5,732 |  |  | $ | 24.73 |  |  | $ | 1,912 |  |  | $ | 1.27 |  |  | $ | 0.97 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 settlements |  |  | — |  |  |  | — |  |  |  | 37,644 |  |  |  | 46,517 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.31 |  |  | $ | 0.98 |
2023 settlements |  |  | — |  |  |  | — |  |  |  | 78,264 |  |  |  | 75,618 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.30 |  |  | $ | 1.00 |
2024 settlements |  |  | — |  |  |  | — |  |  |  | 64,650 |  |  |  | 23,149 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.32 |  |  | $ | 1.01 |
December 31, 2021 |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 settlements |  |  | 1,814 |  |  |  | 6 |  |  |  | 13,371 |  |  |  | 4,575 |  |  | $ | 23.02 |  |  | $ | 1,812 |  |  | $ | 1.39 |  |  | $ | 0.96 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 settlements |  |  | — |  |  |  | — |  |  |  | 57,706 |  |  |  | 59,194 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.28 |  |  | $ | 0.98 |
2023 settlements |  |  | — |  |  |  | — |  |  |  | 76,280 |  |  |  | 71,650 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.29 |  |  | $ | 1.00 |
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] |
|  | March 31, 2022 |  |  | December 31, 2021 |
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 |  | $ | 0.3 |  |  | $ | (0.2 | ) |  | $ | 0.1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Current derivatives liability |  |  | 0.5 |  |  |  | (39.5 | ) |  |  | (39.0 | ) |  |  | 0.7 |  |  |  | (20.1 | ) |  |  | (19.4 | )
Other non-current liabilities |  |  | 0.1 |  |  |  | (43.5 | ) |  |  | (43.4 | ) |  |  | 0.4 |  |  |  | (18.9 | ) |  |  | (18.5 | )

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