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Note 9 - Fair Value Measurement (Tables) | 6 Months Ended
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Jun. 30, 2023
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 (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Gain (loss) on derivative contracts |  | $ | 3,022 |  |  | $ | (689 | ) |  | $ | 4,008 |  |  | $ | (893 | )
Unrealized loss on equity securities investments |  |  | (5,579 | ) |  |  | (15,739 | ) |  |  | (3,385 | ) |  |  | (9,639 | )
Gain on disposition or exchange of investments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 69 |
Total fair value adjustments, net |  | $ | (2,557 | ) |  | $ | (16,428 | ) |  | $ | 623 |  |  | $ | (10,463 | )
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 June 30, 2023 |  |  | Balance at December 31, 2022 |  |  | Input Hierarchy Level
Assets: |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |
Money market funds and other bank deposits |  | $ | 106,786 |  |  | $ | 104,743 |  |  | Level 1
Current and non-current investments: |  |  |  |  |  |  |  |
Equity securities - mining industry |  |  | 20,778 |  |  |  | 24,018 |  |  | Level 1
Trade accounts receivable: |  |  |  |  |  |  |  |
Receivables from provisional concentrate sales |  |  | 15,595 |  |  |  | 45,146 |  |  | Level 2
Restricted cash balances: |  |  |  |  |  |  |  |
Certificates of deposit and other deposits |  |  | 1,166 |  |  |  | 1,164 |  |  | Level 1
Derivative contracts - current and non-current derivatives assets: |  |  |  |  |  |  |  |
Foreign exchange contracts |  |  | 5,404 |  |  |  | 1,518 |  |  | Level 2
Metal forward contracts |  |  | 8,675 |  |  |  | 1,309 |  |  | Level 2
Total assets |  | $ | 158,404 |  |  | $ | 177,898 |  |  |
Liabilities: |  |  |  |  |  |  |  |
Derivative contracts - current derivatives liabilities and other non-current liabilities: |  |  |  |  |  |  |  |
Foreign exchange contracts |  | $ | 2,198 |  |  | $ | 7,548 |  |  | Level 2
Metal forward contracts |  |  | — |  |  |  | 14,643 |  |  | Level 2
Total liabilities |  | $ | 2,198 |  |  | $ | 22,191 |  |  |

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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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + 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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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