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Note 8 - Noncontrolling Interest - Clyra Medical (Tables)
9 Months Ended
Sep. 30, 2025
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, 2023

  1,478,922  $0.31     

Granted

  72,610  $4.18     

Balance, September 30, 2024

  1,551,532  $1.20   6.4 
             

Balance, December 31, 2024

  1,976,863  $1.00     

Granted

  103,774  $4.50     

Balance, September 30, 2025

  2,080,637  $1.17   6.3 

Unvested

  176,667  $0.69     

Vested Balance, September 30, 2025

  2,257,304  $1.22   6.0 
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

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

Expected volatility

  91%  87 - 91%  95 - 117%  99 - 102%  95 - 96%

Expected dividend yield

               

Forfeiture rate

               

Life in years

  10   10   10   10   10 
Warrants Outstanding for Noncontrolling Interest [Table Text Block]
  

Clyra Warrants Outstanding

  

Weighted average price per share

  

Weighted average remaining life

 

Balance, December 31, 2023

  749,911  $3.74     

Granted

  146,083  $7.50     

Vested Balance, September 30, 2024

  895,994  $4.03   2.2 
             

Balance, December 31, 2024

  1,183,182  $4.84     

Granted

  747,991  $7.15     

Exercised

  (241,073) $6.55     

Vested Balance, September 30, 2025

  1,690,100  $5.38   1.8 
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]

Category

 

BioLargo

  

ONM

  

BLEST

  

BioLargo Canada

  

BETI

  

BEST

  

Intercompany amounts

  

Totals

 

Accounts payable

 $315  $341  $87  $49  $  $  $(3) $789 

Accrued payroll

  9   83   2   -   -   8   -   102 

Total

                             $891 

Category

 

BioLargo

  

ONM

  

BLEST

  

BioLargo Canada

  

BETI

  

BEST

  

Intercompany amounts

  

Totals

 

Accounts payable

 $221  $511  $73  $24   31  $  $(34) $826 

Accrued payroll

  12   68   40               120 

Total

                             $946 
Clyra Medical [Member]  
Notes Tables  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]

Category

 

2025

  

2024

 

Accounts payable

 $265  $247 

Accrued dividend

  849   590 

Accrued payroll

  20   30 

Total

 $1,134  $867 
Finance Lease, Liability, to be Paid, Maturity [Table Text Block]

Year ending

    

December 31, 2025

 $36 

December 31, 2026

  150 

December 31, 2027

  150 

December 31, 2028

  150 

Total minimum lease payments

 $486 

Less imputed interest

  (103)

Total finance lease liabilities

 $383 
Clyra Medical Technologies [Member]  
Notes Tables  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

September 30, 2025

  

September 30, 2024

 

Risk free interest rate

  4.27 - 4.45%  3.95 - 4.34%

Expected volatility

  21 - 43%  43 - 49%

Expected dividend yield

      

Forfeiture rate

      

Expected life in years

  10   10