Note 11 - Business Segment Information (Tables)

6 Months Ended

Jun. 30, 2025

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Three Months Ended June 30,						Six Months Ended June 30,
	2025			2024			2025			2024
Revenue
ONM Environmental	$	2,006		$	4,012		$	4,809		$	8,586
BLEST		940			1,259			1,630			1,615
BioLargo Canada		—			—			8			—
Intersegment revenue		(169	)		(257	)		(401	)		(428	)
Total	$	2,777		$	5,014		$	6,046		$	9,773
Stock option expense
BioLargo corporate	$	(292	)	$	(476	)	$	(701	)	$	(905	)
Clyra Medical		(200	)		(63	)		(406	)		(122	)
Total	$	(492	)	$	(539	)	$	(1,107	)	$	(1,027	)
Depreciation expense
BioLargo corporate	$	(10	)	$	(10	)	$	(19	)	$	(19	)
ONM Environmental		(10	)		(8	)		(23	)		(13	)
BLEST		(11	)		(18	)		(28	)		(36	)
Clyra Medical		(3	)		(2	)		(4	)		(4	)
BETI		(2	)		—			(4	)		—
Total	$	(36	)	$	(38	)	$	(78	)	$	(72	)
Research and development expense
BioLargo corporate	$	(219	)	$	(214	)	$	(466	)	$	(537	)
BLEST		(82	)		(336	)		(326	)		(688	)
BETI		(54	)		(133	)		(113	)		(220	)
BioLargo Canada		(120	)		(97	)		(256	)		(177	)
Clyra Medical		(229	)		(100	)		(564	)		(213	)
Intersegment R&D		169			257			401			428
Total	$	(535	)	$	(623	)	$	(1,324	)	$	(1,407	)
Operating income (loss)
BioLargo corporate	$	(1,045	)	$	(1,124	)	$	(1,858	)	$	(2,369	)
ONM Environmental		823			1,490			1,780			3,288
BLEST		16			(247	)		(364	)		(692	)
BETI		(122	)		(226	)		(217	)		(388	)
BEST		(67	)		(49	)		(125	)		(115	)
BioLargo Canada		(144	)		(118	)		(300	)		(223	)
Clyra Medical		(1,263	)		(616	)		(2,580	)		(1,154	)
Total	$	(1,802	)	$	(890	)	$	(3,664	)	$	(1,653	)
Interest income (expense)
BioLargo corporate	$	3		$	(2	)	$	6		$	(5	)
ONM Environmental		33			6			47			4
Clyra Medical		(116	)		(6	)		(198	)		(13	)
Total	$	(80	)	$	(2	)	$	(145	)	$	(14	)

As of June 30, 2025	BioLargo		ONM		BLEST		CLYRA		BETI		BEST		BioLargo Canada		Elimination			Total
Tangible assets	$	797	$	6,932	$	1,128	$	2,441	$	39	$	—	$	6	$	(222	)	$	11,121
Operating lease right-of use		299		—		638		—		—		—		—		—			937
Finance lease right-of-use		—		—		—		418		—		—		—		—			418
Investment in South Korean joint venture		23		—		—		—		—		—		—		—			23
Total	$	1,119	$	6,932	$	1,766	$	2,859	$	39	$	—	$	6	$	(222	)	$	12,499

As of December 31, 2024	BioLargo		ONM		BLEST		CLYRA		BETI		BEST		BioLargo Canada		Elimination			Total
Tangible assets	$	775	$	5,879	$	790	$	1,696	$	46	$	—	$	104	$	(234	)	$	9,056
Operating lease right-of use		333		—		659		—		—		—		—		—			992
Finance lease right-of-use		—		—		—		451		—		—		—		—			451
Investment in South Korean joint venture		14		—		—		—		—		—		—		—			14
Total	$	1,122	$	5,879	$	1,449	$	2,147	$	46	$	—	$	104	$	(234	)	$	10,513