v3.26.1
Note 11 - BioLargo Engineering, Science and Technologies, LLC (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Sep. 30, 2017
Dec. 31, 2025
Dec. 31, 2024
Seven Employees Working at BioLargo Engineering, Science & Technologies, LLC [Member]          
Deferred Compensation Arrangement with Individual, Requisite Service Period (Year)     5 years    
Potential Ownership Percentage of Subsidiary Held by Subsidiary Employees Based on Performance     30.00%    
Incentive Issuance Stipulations for Subsidiary Employees, Accounts Receivable Collected by Year One of Operation     90.00%    
Incentive Issuance Stipulations for Subsidiary Employees, Profit Earned in Year One of Operation     10.00%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value       $ 55,000 $ 55,000
Seven Employees Working at BioLargo Engineering, Science & Technologies, LLC [Member] | Vesting on Performance Metrics [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage 30.00% 26.25%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares) 1,750,000        
Seven Employees Working at BioLargo Engineering, Science & Technologies, LLC [Member] | Non-Qualified Stock Option [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     1,750,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     5 years    
BioLargo Engineering, Science & Technologies, LLC [Member]          
Subsidiary, Ownership Percentage, Parent 70.00%   100.00% 70.00%  
Office Lease, Knoxville, Tennessee Area [Member]          
Lessee, Operating Lease, Term of Contract (Year)     3 years