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Warrants - Class A Warrants, Class B Warrants and Class C warrants (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
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Jul. 01, 2025 USD ($) shares | Jun. 25, 2025 USD ($) $ / shares shares | May 30, 2025 $ / shares shares | Jul. 31, 2025 USD ($) shares | Jun. 30, 2025 USD ($) $ / shares shares | Jun. 30, 2025 USD ($) D $ / shares shares | Jun. 30, 2024 USD ($) | Dec. 31, 2024 $ / shares shares | May 12, 2025 $ / shares | Dec. 31, 2023 shares
Warrants |  |  |  |  |  |  |  |  |  |
Additional paid in capital, warrant issued | $ |  |  |  |  | $ 33,079,000 | $ 33,079,000 |  |  |  |
Proceeds from Registered Direct Offering | $ |  |  |  |  |  | 35,010,000 | $ 9,000,000 |  |  |
Nauru Warrant cost | $ |  |  |  |  | 33,079,000 | $ 33,079,000 |  |  |  |
2025 Registered Direct Offering |  |  |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |
Proceeds from Registered Direct Offering | $ |  |  |  |  | $ 30,000,000 |  |  |  |  |
2025 Registered Direct Offering | Subsequent event |  |  |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |
Proceeds from Registered Direct Offering | $ |  |  |  | $ 7,000,000 |  |  |  |  |  |
Class A Warrants |  |  |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |
Number of warrants outstanding |  |  |  |  | 5,980,770 | 5,980,770 |  | 6,230,770 |  | 3,980,770
Issued |  |  |  |  |  |  |  | 2,250,000 |  |
Class A Warrants | Direct offering |  |  |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |
Number of warrants outstanding |  |  |  |  | 5,980,770 | 5,980,770 |  |  |  |
Exercise price of warrants | $ / shares |  |  |  |  | $ 2 | $ 2 |  |  |  |
Value of outstanding warrants | $ |  |  |  |  | $ 5,100,000 | $ 5,100,000 |  |  |  |
Class B Warrants |  |  |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |
Number of warrants outstanding |  |  |  |  | 3,615,000 | 3,615,000 |  | 7,450,000 |  |
Value of outstanding warrants | $ |  |  |  |  | $ 3,400,000 | $ 3,400,000 |  |  |  |
Warrants term |  |  |  |  | 5 years | 5 years |  |  |  |
Issued |  |  |  |  |  | 2,500,000 |  |  |  |
Class B Warrants | 2024 Registered Direct Offering |  |  |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares |  |  |  |  |  |  |  | $ 2 |  |
Number of shares issuable per warrant |  |  |  |  |  |  |  | 7,450,000 |  |
Class C Warrants |  |  |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |
Number of warrants outstanding |  |  |  |  | 10,003,333 | 10,003,333 |  |  |  |
Exercise price of warrants | $ / shares |  |  |  |  | $ 4.5 | $ 4.5 |  |  |  |
Number of shares issuable per warrant |  |  |  |  | 0 | 0 |  |  |  |
Consecutive trading days for redemption of public warrants | D |  |  |  |  |  | 20 |  |  |  |
Issued |  |  |  |  | 10,003,333 |  |  |  |  |
Threshold cancellation of unexercised warrants offering | $ / shares |  |  |  |  | $ 7 | $ 7 |  |  |  |
Redemption price per warrant (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.0001 |  |  |  |
Minimum threshold written notice period for redemption of public warrants |  |  |  |  |  | 10 days |  |  |  |
Additional paid in capital, warrant issued | $ |  |  |  |  | $ 10,200,000 |  |  |  |  |
Class C Warrants | 2025 Registered Direct Offering |  |  |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares |  |  |  |  |  |  |  |  | $ 3 |
Issued |  |  |  |  | 10,003,333 |  |  |  |  |
Class C Warrants | 2025 Registered Direct Offering | Subsequent event |  |  |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |
Issued | 2,330,000 |  |  | 2,330,000 |  |  |  |  |  |
Proceeds from Registered Direct Offering | $ | $ 7,000,000 |  |  |  |  |  |  |  |  |
Korea Zinc Warrants |  |  |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |
Number of warrants outstanding |  |  |  |  | 6,868,181 | 6,868,181 |  |  |  |
Exercise price of warrants | $ / shares |  | $ 7 |  |  |  |  |  |  |  |
Number of shares issuable per warrant |  |  |  |  | 0 | 0 |  |  |  |
Consecutive trading days for redemption of public warrants | $ |  |  |  |  |  | 20 |  |  |  |
Issued |  | 6,868,181 |  |  |  |  |  |  |  |
Threshold cancellation of unexercised warrants offering | $ / shares |  |  |  |  | $ 10 | $ 10 |  |  |  |
Redemption price per warrant (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.0001 |  |  |  |
Minimum threshold written notice period for redemption of public warrants |  |  |  |  |  | 10 days |  |  |  |
Additional paid in capital, warrant issued | $ |  | $ 3.35 |  |  | $ 11,500,000 |  |  |  |  |
Nauru Warrants |  |  |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares |  |  | $ 4.72 |  |  |  |  |  |  |
Share price | $ / shares |  |  | $ 3.6 |  |  |  |  |  |  |
Issued |  |  | 9,146,268 |  |  |  |  |  |  |
Additional paid in capital, warrant issued | $ |  |  |  |  |  | $ 33,100,000 |  |  |  |
Nauru Warrant cost | $ |  |  |  |  |  | $ 33,100,000 |  |  |  |

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- Definition The minimum threshold period during which a written notice is required for redemption of warrants, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481284/470-20-25-2 + Details
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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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- Definition Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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