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Note 2 - Summary of Significant Accounting Policies (Details Textual)		3 Months Ended		12 Months Ended
	Jun. 06, 2025 USD ($)	Mar. 31, 2026 USD ($) shares	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)	Aug. 05, 2025 USD ($)	Oct. 22, 2021 USD ($)
Accounts Receivable, Allowance for Credit Loss, Current		$ 700,000		$ 700,000
Credit Loss Expense		0	$ 37,000
Inventory Valuation Reserves		0		0
Number of Patents Acquired						3
Intangible Asset, Excluding Goodwill, after Accumulated Amortization						$ 34,000
Contract with Customer, Liability, Current		319,000		280,000
Customer Deposit Liability, Current		188,000		189,000
Unrecognized Tax Benefits		0		$ 0
Operating Lease, Weighted Average Discount Rate, Percent				18.00%
Operating Lease, Right-of-Use Asset		979,000		$ 1,028,000
Operating Lease, Liability		1,027,000		1,074,000
Finance Lease, Right-of-Use Asset, after Accumulated Amortization		310,000		338,000
Clyra Medical Technologies [Member]
Finance Lease, Right-of-Use Asset, after Accumulated Amortization		310,000		338,000
Finance Lease, Liability		$ 336,000		$ 360,000
Subsidiary, Ownership Percentage, Noncontrolling Owner		52.00%		52.00%
BioLargo Engineering, Science & Technologies, LLC [Member]
Subsidiary, Ownership Percentage, Noncontrolling Owner		30.00%		30.00%
BioLargo Energy Technologies, Inc (BETI) [Member]
Subsidiary, Ownership Percentage, Noncontrolling Owner		7.00%		5.00%
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		$ 109,000		$ 109,000
CANADA
Customer Deposit Liability, Current		$ 79,000		80,000
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) \| shares		68,311,167
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) \| shares		32,217,910
Royalty Receivable [Member]
Financing Receivable, before Allowance for Credit Loss					$ 463,520
Pooph Inc. Receivable [Member]
Credit Loss Expense				$ 3,886,000
Financial Asset, Past Due [Member] \| Product Invoice Receivable [Member]
Financing Receivable, before Allowance for Credit Loss	$ 2,385,468
Receivable with Imputed Interest, Effective Yield (Interest Rate)	10.00%
Financial Asset, Past Due [Member] \| Royalty Receivable [Member]
Financing Receivable, before Allowance for Credit Loss	$ 1,378,141