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Note 9 - Fair Value Measurement (Tables) | 9 Months Ended
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Sep. 30, 2022
Table Text Block [Abstract] |
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block] | Fair value adjustments, net is comprised of the following:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
(Loss) gain on derivative contracts |  | $ | 873 |  |  | $ | 12,148 |  |  | $ | (20) |  |  | $ | (4,692 | )
Unrealized loss on investments in equity securities |  |  | (5,110 | ) |  |  | (2,861 | ) |  |  | (14,749 | ) |  |  | (7,117 | )
(Loss) gain on disposition or exchange of investments |  |  | (3 | ) |  |  | — |  |  |  | 66 |  |  |  | 1,158 |
Total fair value adjustments, net |  | $ | (4,240 | ) |  | $ | 9,287 |  |  | $ | (14,703 | ) |  | $ | (10,651 | )
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | The table below sets forth our assets and liabilities that were accounted for at fair value on a recurring basis and the fair value calculation input hierarchy level that we have determined applies to each asset and liability category (in thousands).
Description |  | Balance at September 30, 2022 |  |  | Balance at December 31, 2021 |  |  | Input Hierarchy Level |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds and other bank deposits |  | $ | 144,669 |  |  | $ | 210,010 |  |  |  | Level 1 |
Current and non-current investments |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  |  | 13,299 |  |  |  | 14,470 |  |  |  | Level 1 |
Trade accounts receivable: |  |  |  |  |  |  |  |  |  |  |  |
Receivables from provisional concentrate sales |  |  | 12,477 |  |  |  | 36,437 |  |  |  | Level 2 |
Restricted cash balances: |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit and other deposits |  |  | 1,246 |  |  |  | 1,053 |  |  |  | Level 1 |
Derivative contracts – current and non-current derivatives assets: |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange contracts |  |  | 591 |  |  |  | 5,207 |  |  |  | Level 2 |
Metal forward and put option contracts |  |  | 27,393 |  |  |  | — |  |  |  | Level 2 |
Total assets |  | $ | 199,675 |  |  | $ | 267,177 |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Derivative contracts – current derivatives liabilities and other non-current liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange contracts |  | $ | 11,334 |  |  | $ | 8 |  |  |  | Level 2 |
Metal forward and put option contracts |  |  | — |  |  |  | 37,873 |  |  |  | Level 2 |
Total liabilities |  | $ | 11,334 |  |  | $ | 37,881 |  |  |  |  |

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- Definition Tabular disclosure of the amount of gains or losses for the period included in earnings or resulted in a change to net assets, have arisen from the use of significant unobservable inputs (level 3) to measure the fair value of assets, liabilities, and financial instruments classified in shareholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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