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Note 12 - Fair Value Measurement (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
Description |  | Balance at September 30, 2020 |  |  | Balance at December 31, 2019 |  | Input Hierarchy Level
Assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |
Money market funds and other bank deposits |  | $ | 98,669 |  |  | $ | 62,452 |  | Level 1
Available for sale securities: |  |  |  |  |  |  |  |  |
Equity securities – mining industry |  |  | 17,362 |  |  |  | 6,207 |  | Level 1
Trade accounts receivable: |  |  |  |  |  |  |  |  |
Receivables from concentrate and carbon sales |  |  | 28,464 |  |  |  | 11,952 |  | Level 2
Restricted cash balances: |  |  |  |  |  |  |  |  |
Certificates of deposit and other deposits |  |  | 1,053 |  |  |  | 1,025 |  | Level 1
Derivative contracts: |  |  |  |  |  |  |  |  |
Foreign exchange contracts |  |  | 1,009 |  |  |  | 1,184 |  | Level 2
Metal forward and put option contracts |  |  | — |  |  |  | — |  | Level 2
Total assets |  | $ | 146,557 |  |  | $ | 82,820 |  |
Liabilities: |  |  |  |  |  |  |  |  |
Derivative contracts: |  |  |  |  |  |  |  |  |
Foreign exchange contracts |  | $ | 4,130 |  |  | $ | 1,437 |  | Level 2
Metal forward and put option contracts |  |  | 10,261 |  |  |  | 5,777 |  | Level 2
Total liabilities |  | $ | 14,391 |  |  | $ | 7,214 |  |

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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 http://asc.fasb.org/extlink&oid=117815213&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 http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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