Note 2 - Summary of Significant Accounting Policies (Details Textual) |
12 Months Ended | |
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Dec. 31, 2022
USD ($)
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Dec. 31, 2021
USD ($)
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| Impairment, Long-Lived Asset, Held-for-Use, Total | $ 579,000 | $ 545,000 |
| Number of Operating Segments | 1 | |
| Revenue from Contract with Customer, Excluding Assessed Tax | $ 4,000 | $ 173,000 |
| Percentage of Revenue From Products Transferred at Point in Time | 100.00% | 100.00% |
| Accounts Receivable, after Allowance for Credit Loss, Current, Total | $ 12,000 | $ 269,000 |
| Trade Accounts Receivable [Member] | ||
| Accounts Receivable, after Allowance for Credit Loss, Current, Total | 0 | 17,000 |
| Sale of Inventory [Member] | ||
| Revenue from Contract with Customer, Excluding Assessed Tax | $ 4,000 | $ 173,000 |
| P. Kay Metals [Member] | ||
| Percentage of Revenue From Products Transferred at Point in Time | 100.00% | 100.00% |
| Fair Value, Recurring [Member] | ||
| Assets, Fair Value Disclosure, Total | $ 0 | $ 0 |
| AquaRefining Fire [Member] | ||
| Proceeds from Insurance Settlement, Investing Activities | $ 30,250,000 | |
| X | ||||||||||
- Definition The percentage of revenue to total revenue from products transferred to customers at a point in time. No definition available.
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| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of cash inflow for proceeds from settlement of insurance claim, classified as investing activities. Excludes insurance settlement classified as operating activities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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