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Face (par) amount of debt instrument at time of issuance.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Amount of subscription receivable from investors who have been allocated nonredeemable preferred stock or preferred stock redeemable solely at the option of the issuer.

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The cash inflow from the additional capital contribution to the entity.

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Price of a single share of a number of saleable stocks of a company.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of options vested.

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Per share or per unit amount of equity securities issued.

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Note 14 - Subsequent Events (Details Textual) - USD ($)				3 Months Ended	11 Months Ended	12 Months Ended
Note 14 - Subsequent Events (Details Textual) - USD ($)	Mar. 21, 2023	Jan. 09, 2023	Dec. 20, 2022	Mar. 29, 2023	Dec. 13, 2022	Dec. 31, 2022	Dec. 31, 2021	Mar. 06, 2023	Jan. 01, 2023	Mar. 31, 2021	Mar. 01, 2021
Proceeds from Issuance of Common Stock						$ 3,617,000	$ 4,882,000
Share Price (in dollars per share)						$ 0.20	$ 0.20
Note Payable, Maturing March 8, 2023 [Member]
Debt Instrument, Face Amount										$ 50,000	$ 50,000
Warrants Issued with 2020 Unit Offering [Member] \| Minimum [Member]
Warrants and Rights Outstanding, Term (Year)						6 months	6 months
Warrants Issued with 2020 Unit Offering [Member] \| Maximum [Member]
Warrants and Rights Outstanding, Term (Year)						5 years	5 years
Clyra Medical [Member]
Stock Issued During Period, Shares, New Issues (in shares)							161
Shares Issued, Price Per Share (in dollars per share)			$ 310			$ 310	$ 310
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)						1,829	2,594
Series A Preferred Stock [Member] \| Clyra Medical [Member]
Stock Issued During Period, Shares, New Issues (in shares)			725
Shares Issued, Price Per Share (in dollars per share)			$ 372
Lincoln Park Capital Fund, LLC [Member]
Stock Issued During Period, Shares, New Issues (in shares)					6,011,701	6,011,701	24,255,920
Proceeds from Issuance of Common Stock					$ 1,253,000	$ 1,253,000	$ 4,018,000
Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)				3,500,000
Common Stock, Share Subscribed but Unissued, Subscriptions Receivable				$ 694,640
Subsequent Event [Member] \| Conversion of Clyra Medical Stock Into Biolargo Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)		322
Conversion of Stock, Shares Issued (in shares)		527,983
Conversion of Stock, Conversion Price (in dollars per share)		$ 0.1894
Subsequent Event [Member] \| Chief Financial Officer [Member]
Engagement Extension, Term (Year)	1 year
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Per Month (in shares)	25,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	300,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares)	25,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expected to Vest, Monthly, Number of Shares (in shares)	25,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 0.20
Subsequent Event [Member] \| Chief Financial Officer [Member] \| Share-Based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Subsequent Event [Member] \| BioLargo Energy Technologies, Inc (BETI) [Member]
Noncontrolling Interest, Ownership Percentage by Parent				96.80%
Subsequent Event [Member] \| BioLargo Energy Technologies, Inc (BETI) [Member]
Stock Issued During Period, Shares, New Issues (in shares)				350,000
Share Price (in dollars per share)									$ 2.00
Proceeds from Issuance or Sale of Equity, Total				$ 700,000
Subsequent Event [Member] \| Warrants Expiring Six Month After Investment Date [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)				3,500,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 0.228
Subsequent Event [Member] \| Warrants Expiring Six Month After Investment Date [Member] \| Minimum [Member]
Warrants and Rights Outstanding, Term (Year)				6 months
Subsequent Event [Member] \| Warrants Issued with 2020 Unit Offering [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 0.285
Subsequent Event [Member] \| Warrants Issued with 2020 Unit Offering [Member] \| Maximum [Member]
Warrants and Rights Outstanding, Term (Year)				5 years
Subsequent Event [Member] \| Warrants Expiring Five Years After Investment Date [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				3,787,579
Subsequent Event [Member] \| Warrants Issued to Holder of a 50,000 Note [Member]
Warrants and Rights Outstanding, Term (Year)								5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 0.21
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								200,000
Subsequent Event [Member] \| Clyra Medical [Member] \| Warrant [Member]
Shares Issued, Price Per Share (in dollars per share)				$ 372
Warrants and Rights Outstanding, Term (Year)				3 years
Subsequent Event [Member] \| Biolargo [Member] \| BioLargo Energy Technologies, Inc (BETI) [Member]
Proceeds from Issuance or Sale of Equity, Total				$ 100,000
Subsequent Event [Member] \| Series A Preferred Stock [Member] \| Clyra Medical [Member]
Stock Issued During Period, Shares, New Issues (in shares)				726
Preferred Stock, Shares Subscribed but Unissued, Subscriptions Receivable				$ 225,000
Shares Issued, Price Per Share (in dollars per share)				$ 310
Subsequent Event [Member] \| Lincoln Park Capital Fund, LLC [Member]
Stock Issued During Period, Shares, New Issues (in shares)				545,402
Proceeds from Issuance of Common Stock				$ 105,000