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Note 8 - Derivative Instruments (Tables) | 6 Months Ended
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Jun. 30, 2021
Notes Tables |
Schedule of Foreign Exchange Contracts, Statement of Financial Position [Table Text Block] |
|  | June 30, |  |  | December 31, |
Balance sheet line item: |  | 2021 |  |  | 2020 |
Current derivatives assets |  | $ | 5.5 |  |  | $ | 3.5 |
Non-current derivatives assets |  |  | 4.9 |  |  |  | 4.2 |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
June 30, 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 settlements |  |  | 2,344 |  |  |  | 7 |  |  |  | 17,857 |  |  |  | 11,762 |  |  | $ | 26.76 |  |  | $ | 1,810 |  |  | $ | 1.32 |  |  | $ | 1.00 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 settlements |  |  | — |  |  |  | — |  |  |  | 15,708 |  |  |  | 14,991 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.24 |  |  | $ | 0.94 |
2022 settlements |  |  | — |  |  |  | — |  |  |  | 66,855 |  |  |  | 50,982 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.28 |  |  | $ | 0.96 |
2023 settlements |  |  | — |  |  |  | — |  |  |  | 76,280 |  |  |  | 52,249 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.29 |  |  | $ | 1.00 |
2024 settlements |  |  | — |  |  |  | — |  |  |  | 15,047 |  |  |  | — |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.33 |  |  |  | N/A |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 settlements |  |  | 1,282 |  |  |  | 4 |  |  |  | 23,314 |  |  |  | 4,905 |  |  | $ | 25.00 |  |  | $ | 1,858 |  |  | $ | 1.19 |  |  | $ | 0.90 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 settlements |  |  | — |  |  |  | — |  |  |  | 41,577 |  |  |  | 30,876 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.17 |  |  | $ | 0.88 |
2022 settlements |  |  | — |  |  |  | — |  |  |  | 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] |
|  | June 30, 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) |
Current derivatives assets |  | $ | 0.7 |  |  | $ | (0.3 | ) |  | $ | 0.4 |  |  | $ | 0.2 |  |  | $ | (0.2 | ) |  | $ | — |
Non-current derivatives assets |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.5 |  |  |  | (0.1 | ) |  |  | 0.4 |
Current derivatives liabilities |  |  | 2.1 |  |  |  | (8.9 | ) |  |  | (6.8 | ) |  |  | 0.1 |  |  |  | (11.8 | ) |  |  | (11.7 | )
Non-current derivatives liabilities |  |  | 0.9 |  |  |  | (8.0 | ) |  |  | (7.1 | ) |  |  | — |  |  |  | — |  |  |  | — |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + 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 -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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