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Note 8 - Noncontrolling Interest - Clyra Medical (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Schedule of Other Ownership Interests [Table Text Block]
  

Outstanding

  Weighted average price per share  

Weighted average remaining life

 

Balance, December 31, 2023

  1,478,922  $0.31     

Granted

  50,055  $4.03     

Balance, June 30, 2024

  1,528,977  $0.43     

Unvested

  (3,075) $2.71     

Vested Balance, June 30, 2024

  1,525,902  $0.43     
             

Balance, December 31, 2024

  1,976,863  $1.00     

Granted

  50,664  $4.50     

Balance, June 30, 2025

  2,027,527  $1.09   6.4 

Unvested

  (200,000) $0.01     

Vested Balance, June 30, 2025

  1,827,527  $1.21   6.2 
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%  4.23 - 4.58%  4.34%  4.16%  3.75 - 4.58%

Expected volatility

  91%  90 - 91%  96%  99%  91 - 96%

Expected dividend yield

               

Forfeiture rate

               

Life in years

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

Outstanding

  

Weighted average price per share

  

Weighted average remaining life

 

Balance, December 31, 2023

  749,911  $3.74     

Granted

  111,500  $7.50     

Vested Balance, June 30, 2024

  861,411  $3.96     
             

Balance, December 31, 2024

  1,183,182  $4.84     

Granted

  470,002  $6.94     

Expired

  (224,944) $7.24     

Vested Balance, June 30, 2025

  1,428,240  $4.87   1.9 
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]

Category

 

BioLargo

  

ONM

  

BLEST

  

BioLargo Canada

  

BETI

  

BEST

  

Intercompany amounts

  

Totals

 

Accounts payable

 $236  $798  $117  $28  $20  $  $(22) $1,177 

Accrued payroll

  9   83   152         9      253 

Total

                             $1,430 

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

 $404  $247 

Accrued dividend

  762   590 

Accrued payroll

  17   30 

Total

 $1,183  $867 
Finance Lease, Liability, to be Paid, Maturity [Table Text Block]

Year ending

    

December 31, 2025

 $74 

December 31, 2026

  150 

December 31, 2027

  150 

December 31, 2028

  150 

Total minimum lease payments

 $524 

Less imputed interest

  (119)

Total finance lease liabilities

 $405 
Clyra Medical Technologies [Member]  
Notes Tables  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

June 30, 2025

  

June 30, 2024

 

Risk free interest rate

  4.36 - 4.45%  4.16 - 4.34%

Expected volatility

  35 - 43%  49%

Expected dividend yield

      

Forfeiture rate

      

Expected life in years

  10   10