Note 10 - BioLargo Energy Technologies, Inc. (Details Textual) - USD ($) |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Jan. 01, 2023 |
|
| BioLargo Energy Technologies, Inc (BETI) [Member] | |||
| Stock Issued During Period, Shares, New Issues (in shares) | 124,867 | 0 | |
| Shares Issued, Price Per Share (in dollars per share) | $ 3.7 | ||
| Proceeds from Issuance or Sale of Equity | $ 462,000 | ||
| BioLargo Energy Technologies, Inc (BETI) [Member] | |||
| Investment Owned, Balance, Shares (in shares) | 9,095,000 | 9,000,000 | |
| Shares, Outstanding (in shares) | 9,730,691 | ||
| Shares, Issued (in shares) | 9,730,691 | ||
| Subsidiary, Parent Ownership Interest | 93.00% | ||
| X | ||||||||||
- Definition The percentage ownership interest of a subsidiary owned by the parent. No definition available.
|
| X | ||||||||||
- Definition Number of shares of investment owned. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. No definition available.
|
| X | ||||||||||
- Definition Per share or per unit amount of equity securities issued. No definition available.
|
| X | ||||||||||
- Definition Number of shares issued which are neither cancelled nor held in the treasury. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|