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Fair Value Measurement (Tables) | 12 Months Ended
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Dec. 31, 2022
Fair Value Measurement |
Assets measured at fair value by level within fair value hierarchy | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​ | As of | ​ | ​
​ | ​ | December 31, | ​ | December 31, | ​ | Input Hierarchy Level
​ | ​ | 2022 | ​ | 2021 | ​ | ​
​ | ​ | (in thousands) | ​ | ​
Cash and cash equivalents | ​ | $ | 23,675 | ​ | $ | 33,712 | ​ | Level 1
Accounts receivable, net | ​ | $ | 5,085 | ​ | $ | 8,672 | ​ | Level 2
Investment in equity securities-Maritime | ​ | $ | 1,559 | ​ | $ | - | ​ | Level 1
Investment in equity securities-Green Light Metals | ​ | $ | 3,611 | ​ | $ | - | ​ | Level 3
Derivative liability - zinc zero cost collar | ​ | $ | - | ​ | $ | (1,844) | ​ | Level 2
​
Gains and Losses Related to Changes in Fair Value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | For the year ended December 31, | ​ | Statements of Operations Classification
​ | ​ | ​ | 2022 | ​ | 2021 | ​ | ​
​ | Note | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Realized and unrealized derivative (loss) gain, net | 14 | ​ | $ | (363) | ​ | $ | 1,002 | ​ | Sales, net
Realized loss on zinc zero cost collar | 17 | ​ | $ | (2,014) | ​ | $ | (1,156) | ​ | Realized and unrealized loss on zinc zero cost collar
Unrealized gain (loss) on zinc zero cost collar | 17 | ​ | $ | 1,844 | ​ | $ | (1,844) | ​ | Realized and unrealized loss on zinc zero cost collar
​
Realized and Unrealized Gain Losses on Derivatives | The following tables summarize the Company’s realized/unrealized derivatives, net (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gold | ​ | Silver | ​ | Copper | ​ | Lead | ​ | Zinc | ​ | Total
For the year ended December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Realized loss | ​ | $ | (79) | ​ | $ | - | ​ | $ | (127) | ​ | $ | (150) | ​ | $ | (364) | ​ | $ | (720)
Unrealized gain (loss) | ​ | ​ | 136 | ​ | ​ | 433 | ​ | ​ | 7 | ​ | ​ | 153 | ​ | ​ | (372) | ​ | ​ | 357
Total realized/unrealized derivatives, net | ​ | $ | 57 | ​ | $ | 433 | ​ | $ | (120) | ​ | $ | 3 | ​ | $ | (736) | ​ | $ | (363)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gold | ​ | Silver | ​ | Copper | ​ | Lead | ​ | Zinc | ​ | Total
For the year ended December 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Realized (loss) gain | ​ | $ | (47) | ​ | $ | (44) | ​ | $ | 73 | ​ | $ | 163 | ​ | $ | 632 | ​ | $ | 777
Unrealized (loss) gain | ​ | ​ | - | ​ | ​ | (159) | ​ | ​ | 6 | ​ | ​ | (2) | ​ | ​ | 380 | ​ | ​ | 225
Total realized/unrealized derivatives, net | ​ | $ | (47) | ​ | $ | (203) | ​ | $ | 79 | ​ | $ | 161 | ​ | $ | 1,012 | ​ | $ | 1,002
​

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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 the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging 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 4B -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + 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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