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Note 14 - Subsequent Events (Details Textual) - USD ($)	1 Months Ended	3 Months Ended
Note 14 - Subsequent Events (Details Textual) - USD ($)	Apr. 30, 2026	Mar. 31, 2026	Mar. 31, 2025	Apr. 01, 2026
Proceeds from Issuance of Common Stock		$ 256,000	$ (15,000)
BioLargo Energy Technologies, Inc (BETI) [Member]
Stock Issued During Period, Shares, New Issues (in shares)		124,867	0
Shares Issued, Price Per Share (in dollars per share)		$ 3.7
Subsequent Event [Member] \| BioLargo Energy Technologies, Inc (BETI) [Member]
Stock Issued During Period, Shares, New Issues (in shares)	6,757
Proceeds from Issuance of Common Stock	$ 25,000
Shares Issued, Price Per Share (in dollars per share)	$ 3.7
Subsequent Event [Member] \| Clyra Medical [Member] \| Warrants Issued with Guaranteed Promissory Note [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 7.5
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				51,675
Subsequent Event [Member] \| Secured Debt [Member] \| Clyra Medical [Member]
Debt Instrument, Face Amount				$ 7
Debt Instrument, Interest Rate, Stated Percentage				15.00%
Clearthink Capital Partners, LLC [Member]
Shares Issued, Price Per Share (in dollars per share)		$ 0.17
Clearthink Capital Partners, LLC [Member] \| Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)	1,050,000
Proceeds from Issuance of Common Stock	$ 147,033