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Note 11 - Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Foreign Exchange Contracts, Statement of Financial Position [Table Text Block] |
|  | December 31, |
Balance sheet line item: |  | 2020 |  |  | 2019 |
Other current assets |  | $ | 3.5 |  |  | $ | 0.6 |
Other non-current assets |  |  | 4.2 |  |  |  | 0.6 |
Current derivatives liability |  |  | — |  |  |  | 0.4 |
Other non-current assets |  |  | — |  |  |  | 1.0 |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
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 |  |  | — |  |  |  | — |  |  |  | 41,557 |  |  |  | 30,876 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.17 |  |  | $ | 0.88 |
2022 settlements |  |  | — |  |  |  | — |  |  |  | 18,519 |  |  |  | — |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.28 |  |  |  | N/A |
December 31, 2019 |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 settlements |  |  | 2,556 |  |  |  | 10 |  |  |  | 21,550 |  |  |  | 5,159 |  |  | $ | 17.20 |  |  | $ | 1,481 |  |  | $ | 1.04 |  |  | $ | 0.88 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 settlements |  |  | — |  |  |  | — |  |  |  | 441 |  |  |  | 11,740 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.13 |  |  | $ | 0.98 |
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] |
|  | December 31, 2020 |  |  | December 31, 2019 |
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 |  |  | 0.1 |  |  |  | (11.8 | ) |  |  | (11.7 | ) |  |  | 2.1 |  |  |  | (7.9 | ) |  |  | (5.8 | )

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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=121590274&loc=SL5618551-113959 + Details
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