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Fair Value Measurement (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Measurement |
Assets measured at fair value by level within fair value hierarchy |
|  | 2018 |  | 2017 |  | Input Hierarchy Level
|  | (in thousands) |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |
Bank deposits |  | $ | 26,645 |  | $ | 22,390 |  | Level 1
Gold and silver rounds/bullion |  |  | 3,664 |  |  | 3,812 |  | Level 1
Accounts receivable: |  |  |  |  |  |  |  |
Receivables from provisional concentrate sales |  |  | 1,727 |  |  | 2,884 |  | Level 2
|  | $ | 32,036 |  | $ | 29,086 |  |
Gains and Losses Related to Changes in Fair Value |
|  | Three months ended June 30, |  | Six months ended June 30, |  |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | Statement of Operations Classification
|  | (in thousands) |  |
Realized/unrealized derivative (loss) gain |  | $ | (2,303) |  | $ | (24) |  | $ | (1,732) |  | $ | 511 |  | Sales, net
Gold and silver rounds/bullion (loss) gain |  | $ | (160) |  | $ | (148) |  | $ | (144) |  | $ | 154 |  | Other expense, net
Realized and Unrealized Gain Losses on Derivatives |
|  | Gold |  | Silver |  | Copper |  | Lead |  | Zinc |  | Total
Three months ended June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gain (loss) |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | -
Unrealized (loss) gain |  | $ | (38) |  | $ | 13 |  | $ | (103) |  | $ | (138) |  | $ | (2,037) |  | $ | (2,303)
|  | Gold |  | Silver |  | Copper |  | Lead |  | Zinc |  | Total
Three months ended June 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gain (loss) |  | $ | 177 |  | $ | 236 |  | $ | 23 |  | $ | 12 |  | $ | (220) |  | $ | 228
Unrealized (loss) gain |  | $ | (138) |  | $ | (236) |  | $ | (7) |  | $ | 2 |  | $ | 127 |  | $ | (252)
|  | Gold |  | Silver |  | Copper |  | Lead |  | Zinc |  | Total
Six months ended June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gain (loss) |  | $ | 14 |  | $ | (53) |  | $ | 53 |  | $ | (5) |  | $ | 991 |  | $ | 1,000
Unrealized gain (loss) |  | $ | 62 |  | $ | 162 |  | $ | (203) |  | $ | (161) |  | $ | (2,592) |  | $ | (2,732)
|  | Gold |  | Silver |  | Copper |  | Lead |  | Zinc |  | Total
Six months ended June 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gain (loss) |  | $ | 129 |  | $ | 190 |  | $ | 37 |  | $ | 48 |  | $ | (177) |  | $ | 227
Unrealized gain (loss) |  | $ | 32 |  | $ | (9) |  | $ | 19 |  | $ | 60 |  | $ | 182 |  | $ | 284

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the realized and unrealized gains and losses reported in the statement of income which have resulted from the sale and holding of marketable securities, respectively, as well as the sale or disposal of cost method investments. Such amounts would include realized gains and losses on the sale or disposal of trading, available-for-sale, and held-to-maturity securities, unrealized gains and losses on trading securities, unrealized gains and losses on available-for-sale and held-to-maturity securities transferred to the trading securities category, realized gains and losses on the sale or disposal of cost method investments, and losses recognized for other than temporary impairments (OTTI) of such investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.M) -URI http://asc.fasb.org/extlink&oid=65877573&loc=d3e87990-122713 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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