Note 8 - Noncontrolling Interest - Clyra Medical (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

Schedule of Other Ownership Interests [Table Text Block]

	Clyra Options Outstanding			Weighted average price per share		Weighted average remaining life
Balance, December 31, 2022		1,583,329		$	0.06
Granted		42,582			1.48
Balance, March 31, 2023		1,625,911		$	0.09		7.5
Balance, December 31, 2023		1,478,922		$	0.06
Granted		25,833		$	4.05
Balance, March 31, 2024		1,504,755		$	0.38		6.8
Unvested		(12,300	)	$	2.71
Balance, March 31, 2024		1,492,455		$	0.36		6.8

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2024						2023
	Non Plan			2018 Plan			Non Plan			2018 Plan
Risk free interest rate		—	%		4.16	%		3.48	%		3.48	%
Expected volatility		—	%		99	%		114	%		114	%
Expected dividend yield		—			—			—			—
Forfeiture rate		—			—			—			—
Life in years		—			10			10			10

Warrants Outstanding for Noncontrolling Interest [Table Text Block]

	Clyra warrants outstanding		Weighted average price per share	Weighted average remaining life
Balance, December 31, 2022	207,513	$	3.72
Granted	72,581	$	3.72
Balance, March 31, 2023	280,094	$	3.72	3.5
Balance, December 31, 2023	749,911	$	3.74
Granted	47,500	$	7.50
Balance, March 31, 2024	797,411	$	3.96	2.7

Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]

Category	BioLargo		ONM		BLEST		Canada		BETI		BEST		Intercompany amounts			Totals
Accounts payable	$	200	$	1,357	$	62	$	44	$	24	$	—	$	(24	)	$	1,663
Accrued payroll		13		39		22		—		—		3		—			77
Total																$	1,740

Category	BioLargo		ONM		BLEST		Canada		BETI		BEST		Intercompany amounts			Totals
Accounts payable	$	163	$	964	$	34	$	93		40	$	—	$	(82	)	$	1,212
Accrued payroll		49		86		116		—		—		—		—			251
Accrued interest		25		—		—		—		—		—		—			25
Total																$	1,488

Clyra Medical [Member]

Notes Tables

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	March 31, 2024			December 31, 2023
Risk free interest rate		4.16	%		3.48 - 4.45	%
Expected volatility		49	%		49	%
Expected dividend yield		—			—
Forfeiture rate		—			—
Expected life in years		10			10

Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]

Category	2024		2023
Accounts payable	$	417	$	135
Accrued dividend		328	$	242
Accrued payroll		12		7
Accrued interest		15		13
Total	$	772	$	397