v3.26.1
Note 2 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2025
Notes Tables  
Schedule of Cash and Cash Equivalents [Table Text Block]
  

December 31,

  

December 31,

 
  

2025

  

2024

 

BioLargo, Inc. and subsidiaries

 $2,826  $3,175 

Clyra Medical Technologies, Inc.

  1,057   373 

Total

 $3,883  $3,548 
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  

December 31,

  

December 31,

 
  

2025

  

2024

 

Customer A

  59%  77%
  

December 31,

  

December 31,

 
  

2025

  

2024

 

Customer A

  0%  82%
Schedule of Inventory, Current [Table Text Block]
  

December 31,

  

December 31,

 
  

2025

  

2024

 

Raw material

 $125  $210 

Finished goods

  185   120 

Total

 $310  $330 
Schedule of Other Assets, Noncurrent [Table Text Block]
  

December 31,

  

December 31,

 
  

2025

  

2024

 

Patents

 $34  $34 

Security deposits

  72   61 

Total

 $106  $95 
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

2025

  

2024

 

Stock options

  72,566,578   60,047,577 

Warrants

  31,244,078   31,615,616 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  2025   2024 
  

Non Plan

  

2024 Plan

  

Non Plan

  

2018 Plan

  

2024 Plan

 

Risk free interest rate

  4.10 - 4.23%  3.69 - 4.58%  3.81 - 4.34%  4.16%  3.75 - 4.58%

Expected volatility

  87 - 91%  73 - 91%  95 - 117%  99%  91 - 96%

Expected dividend yield

               

Forfeiture rate

               

Life in years

  10   5 - 10   10   10   10 
Property, Plant and Equipment [Table Text Block]
  

2025

  

2024

 

Equipment

 $1,724  $1,678 

Leasehold improvements

  526   526 

Total, at cost

  2,250   2,204 

Less: accumulated depreciation

  (607)  (462)

Total equipment and leasehold improvements, net

 $1,643  $1,742