Note 8 - Noncontrolling Interest - Clyra Medical (Tables)
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6 Months Ended |
Jun. 30, 2026 |
| 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, 2024 | | | 1,976,863 | | | $ | 1.00 | | | | | |
| Granted | | | 50,664 | | | $ | 4.50 | | | | | |
| Balance, June 30, 2025 | | | 2,027,527 | | | $ | 1.09 | | | | | |
| Unvested | | | (200,000 | ) | | $ | 0.01 | | | | | |
| Vested Balance, June 30, 2025 | | | 1,827,527 | | | $ | 1.21 | | | | | |
| | | | | | | | | | | | | |
| Balance, December 31, 2025 | | | 3,013,692 | | | $ | 2.01 | | | | | |
| Granted | | | 232,143 | | | $ | 4.46 | | | | | |
| Exercised | | | (500,000 | ) | | $ | 0.01 | | | | | |
| Balance, June 30, 2026 | | | 2,745,835 | | | $ | 2.58 | | | | 7.6 | |
| Unvested | | | (719,791 | ) | | $ | 4.19 | | | | | |
| Vested Balance, June 30, 2026 | | | 2,026,044 | | | $ | 2.01 | | | | 7.0 | |
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| Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
| | | 2026 | | | 2025 | |
| | | Non Plan | | | 2024 Plan | | | Non Plan | | | 2024 Plan | |
| Risk free interest rate | | | — | | | | 4.30 - 4.47 | % | | | 4.23 | % | | | 4.23 - 4.58 | % |
| Expected volatility | | | — | | | | 84 | % | | | 91 | % | | | 90 - 91 | % |
| Expected dividend yield | | | — | | | | — | | | | — | | | | — | |
| Forfeiture rate | | | — | | | | — | | | | — | | | | — | |
| Life in years | | | — | | | | 10 | | | | 10 | | | | 10 | |
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| Warrants Outstanding for Noncontrolling Interest [Table Text Block] |
| | | Clyra Warrants Outstanding | | | Weighted average price per share | | | Weighted average remaining life | |
| Balance, December 31, 2024 | | | 1,183,182 | | | $ | 4.84 | | | | | |
| Granted | | | 470,002 | | | $ | 6.94 | | | | | |
| Expired | | | (224,944 | ) | | $ | 7.24 | | | | | |
| Vested Balance, June 30, 2025 | | | 1,428,240 | | | $ | 4.87 | | | | | |
| | | | | | | | | | | | | |
| Balance, December 31, 2025 | | | 1,702,496 | | | $ | 5.39 | | | | | |
| Granted | | | 226,344 | | | $ | 7.50 | | | | | |
| Expired | | | (358,810 | ) | | $ | 3.72 | | | | | |
| Vested Balance, June 30, 2026 | | | 1,570,030 | | | $ | 6.13 | | | | 1.8 | |
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| Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] |
| Category | | BioLargo | | | ONM | | | BLEST | | | BioLargo Canada | | | BETI | | | BEST | | | Intercompany amounts | | | Totals | |
| Accounts payable | | $ | 468 | | | $ | 270 | | | $ | 5 | | | $ | 134 | | | $ | — | | | $ | — | | | $ | (3 | ) | | $ | 874 | |
| Accrued payroll | | | 50 | | | | 73 | | | | 250 | | | | - | | | | — | | | | - | | | | — | | | | 373 | |
| Total | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | 1,247 | |
| Category | | BioLargo | | | ONM | | | BLEST | | | BioLargo Canada | | | BETI | | | BEST | | | Intercompany amounts | | | Totals | |
| Accounts payable | | $ | 588 | | | $ | 305 | | | $ | — | | | $ | 100 | | | | 43 | | | $ | — | | | $ | (24 | ) | | $ | 1,012 | |
| Accrued payroll | | | 10 | | | | 85 | | | | 73 | | | | 22 | | | | — | | | | 9 | | | | — | | | | 199 | |
| Total | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | 1,211 | |
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| Clyra Medical [Member] |
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| Notes Tables |
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| Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] |
| Category | | 2026 | | | 2025 | |
| Accounts payable | | $ | 489 | | | $ | 634 | |
| Accrued dividend | | | 1,109 | | | | 937 | |
| Accrued payroll | | | 31 | | | | 21 | |
| Total | | $ | 1,629 | | | $ | 1,592 | |
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| Finance Lease, Liability, to be Paid, Maturity [Table Text Block] |
| Year ending | | | | |
| December 31, 2026 | | $ | 75 | |
| December 31, 2027 | | | 150 | |
| December 31, 2028 | | | 150 | |
| Total minimum lease payments | | $ | 375 | |
| Less imputed interest | | | (64 | ) |
| Total finance lease liabilities | | $ | 311 | |
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| Clyra Medical Technologies [Member] |
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| Notes Tables |
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| Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
| | | June 30, 2026 | | | June 30, 2025 | |
| Risk free interest rate | | | 4.20 - 4.36 | % | | | 4.36 - 4.45 | % |
| Expected volatility | | | 35 - 39 | % | | | 35 - 43 | % |
| Expected dividend yield | | | — | | | | — | |
| Forfeiture rate | | | — | | | | — | |
| Expected life in years | | | 10 | | | | 10 | |
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