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Note 10 - BioLargo Engineering, Science and Technologies, LLC (Details Textual)
1 Months Ended
Sep. 30, 2017
USD ($)
shares
BioLargo Engineering, Science & Technologies, LLC [Member]  
Noncontrolling Interest, Ownership Percentage by Parent 100.00%
Seven Employees Working at BioLargo Engineering, Science & Technologies, LLC [Member]  
Increase To Monthly Budget for Employee Related Liabilities | $ $ 100,000
Deferred Compensation Arrangement with Individual, Requisite Service Period 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%
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 | shares 2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years
Leased Property in Knoxville, Tennessee for BioLargo Engineering, Science & Technologies, LLC [Member]  
Lessee, Operating Lease, Term of Contract 3 years