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Note 10 - Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Foreign Exchange Contracts, Statement of Financial Position [Table Text Block] |
|  | December 31, |
Balance sheet line item: |  | 2021 |  |  | 2020 |
Other current assets |  | $ | 2.7 |  |  | $ | 3.5 |
Other non-current assets |  |  | 2.5 |  |  |  | 4.2 |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
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 |
December 31, 2020 |  | 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 |  |  | 1,282 |  |  |  | 4 |  |  |  | 23,314 |  |  |  | 4,905 |  |  | $ | 25.00 |  |  | $ | 1,858 |  |  | $ | 1.19 |  |  | $ | 0.90 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 settlements |  |  | — |  |  |  | — |  |  |  | 41,577 |  |  |  | 30,876 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.17 |  |  | $ | 0.88 |
2023 settlements |  |  | N/A |  |  |  | N/A |  |  |  | 18,519 |  |  |  | — |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.28 |  |  |  | N/A |
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] |
|  | December 31, 2021 |  |  | December 31, 2020 |
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 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 0.2 |  |  | $ | (0.2 | ) |  | $ | — |
Other non-current assets |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.5 |  |  |  | (0.1 | ) |  |  | 0.4 |
Current derivatives liability |  |  | 0.7 |  |  |  | (20.1 | ) |  |  | (19.4 | ) |  |  | 0.1 |  |  |  | (11.8 | ) |  |  | (11.7 | )
Non-current derivatives liability |  |  | 0.4 |  |  |  | (18.9 | ) |  |  | (18.5 | ) |  |  | — |  |  |  | — |  |  |  | — |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + Details
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