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Note 3 - Investments (Details Textual) - USD ($) |  |  |  |  | 3 Months Ended | 12 Months Ended | 84 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 30, 2026 | Mar. 26, 2026 | Dec. 31, 2025 | Mar. 01, 2024 | Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2025
Income (Loss) from Equity Method Investments |  |  |  |  | $ (251,844) | $ 41,438 |  |
Proceeds from Issuance of Debt |  |  |  |  | 0 | 10,000,000 |  |
Conversion of Sierra Springs Advances Into Sierra Springs Common Stock [Member] |  |  |  |  |  |  |  |
Payments to Acquire Investments |  |  | $ 9,400,000 |  | 5,750,000 |  |  |
Debt Conversion, Original Debt, Amount | $ 2,000,000 | $ 15,150,000 |  |  | $ 15,150,000 |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | 3,076,923 | 23,307,692 |  |  | 23,307,692 |  |  |
Debt Conversion, Conversion Rate, Price Per Share (in dollars per share) | $ 0.65 | $ 0.65 |  |  | $ 0.65 |  |  |
Sierra Springs Opportunity Fund, Inc. (SSOF) [Member] |  |  |  |  |  |  |  |
Income (Loss) from Equity Method Investments |  |  |  |  | $ (227,844) |  |  |
Payments to Acquire Investments |  |  |  |  |  |  |  | $ 8,500,000
Investment Owned, Balance, Shares (in shares) |  |  | 11,236,111 |  | 37,620,726 |  | 11,236,111 | 11,236,111
Subsidiary, Ownership Percentage, Noncontrolling Owner |  |  | 16.99% |  | 40.66% |  | 16.99% | 16.99%
Proceeds from Issuance of Debt |  |  |  |  | $ 5,750,000 |  | $ 9,400,000 |
Investment, Maximum Exposure to Loss |  |  |  |  | $ 37,147,156 |  |  |
Green Li-ion Pte, Ltd. [Member] |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) |  |  | 35,662 |  | 35,662 |  | 35,662 | 35,662
Subsidiary, Ownership Percentage, Noncontrolling Owner |  |  | 13.34% |  | 13.34% |  | 13.34% | 13.34%
Unrealized Gain (Loss) on Investments |  |  |  |  | $ 0 | 0 |  |
Research and Development Company [Member] |  |  |  |  |  |  |  |
Income (Loss) from Equity Method Investments |  |  |  | $ 1,290,614 | (24,000) | 41,438 |  |
Payable, Investment, Purchase |  |  |  |  | 1,284,022 |  |  |
Payments to Acquire Equity Method Investments |  |  |  |  | $ 0 | $ 0 |  |

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