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Note 2 - Summary of Significant Accounting Policies (Details Textual)		3 Months Ended		12 Months Ended
	Mar. 20, 2020 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2022	Oct. 22, 2021 USD ($)
Accounts Receivable, Allowance for Credit Loss, Current		$ 84,000		$ 84,000
Inventory Valuation Reserves		212,000		212,000
Number of Patents Acquired							3
Income (Loss) from Equity Method Investments		(1,000)	$ (6,000)
Contract with Customer, Liability		261,000		303,000
Contract with Customer, Liability, Revenue Recognized		42,000
Customer Deposit Liability, Current		226,000		117,000
Revenue Recognized from Customer Deposits		4,000
Unrecognized Tax Benefits		$ 0		0
Operating Lease, Weighted Average Discount Rate, Percent		18.00%
Operating Lease, Right-of-Use Asset		$ 1,068,000		1,092,000
Operating Lease, Liability		$ 1,090,000		1,109,000
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		10 years
Canadian Government Grants [Member] \| Minimum [Member]
Grant Term (Month)		6 months
Canadian Government Grants [Member] \| Maximum [Member]
Grant Term (Month)		18 months
ONM [Member]
Customer Deposit Liability, Current		$ 116,000			$ 4,000
CANADA
Customer Deposit Liability, Current		$ 110,000		$ 113,000
Odin Co Ltd [Member]
Payments to Acquire Interest in Joint Venture	$ 100,000
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	40.00%	40.00%
Income (Loss) from Equity Method Investments		$ 1,000	$ 6,000
Odin Co Ltd [Member] \| Tomorrow Water [Member]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	30.00%
Odin Co Ltd [Member] \| BKT and Tomorrow Water [Member]
Payments to Acquire Interest in Joint Venture	$ 150,000
Clyra Medical Technologies [Member]
Subsidiary, Ownership Percentage, Noncontrolling Owner				47.00%		47.00%
BioLargo Engineering, Science & Technologies, LLC [Member]
Subsidiary, Ownership Percentage, Noncontrolling Owner				23.00%		18.00%
BioLargo Energy Technologies, Inc (BETI) [Member]
Subsidiary, Ownership Percentage, Noncontrolling Owner				4.00%
Patents [Member]
Intangible Assets, Net (Excluding Goodwill), Total							$ 34,000
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Number of Major Customers				1
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| One Customer [Member]
Concentration Risk, Percentage				10.00%