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Note 9 - BioLargo Engineering, Science and Technologies, LLC (Details Textual) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended 25 Months Ended
Sep. 30, 2017
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2019
Share-based Payment Arrangement, Noncash Expense, Total   $ 1,269,000 $ 1,455,000      
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%          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       1,242,500    
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%          
Percentage of Profit Interest         13.00%  
Percentage of Profits Interests Vested       18.00% 11.00%  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value       $ 135,000 $ 65,000  
Seven Employees Working at BioLargo Engineering, Science & Technologies, LLC [Member] | Share-Based Payment Arrangement, Tranche One [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)         455,000  
Seven Employees Working at BioLargo Engineering, Science & Technologies, LLC [Member] | Share-Based Payment Arrangement, Tranche Two [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)         525,000  
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          
Share-based Payment Arrangement, Noncash Expense, Total           $ 0
BioLargo Engineering, Science & Technologies, LLC [Member]            
Subsidiary, Ownership Percentage, Parent 100.00%