v3.26.1
Note 5 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Jan. 31, 2025
Jan. 01, 2025
Dec. 31, 2024
Sep. 30, 2024
Aug. 13, 2024
Jun. 30, 2024
Jun. 13, 2024
Mar. 31, 2024
Jun. 22, 2018
Sep. 07, 2017
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Stock Issued During Period, Shares, Issued for Services (in shares)                                     2,807,771 1,107,594  
Stock Issued During Period, Value, Issued for Services                                     $ 557,000 $ 284,000  
Share Price (in dollars per share) $ 0.18                                   $ 0.18   $ 0.18
2024 Equity Incentive Plan [Member]                                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)                     10 years                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Per Year (in shares)           2                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) 42,000,000                                   42,000,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 25,206,986                                   25,206,986    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                                     11,299,094 5,493,920  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                                     $ 0.2 $ 0.23  
2018 Equity Incentive Plan [Member]                                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)                         10 years                
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)                   9,343,614             9,343,614        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                                       1,547,938  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 334,000                                   $ 334,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                                     3 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)                                     566,951 485,000  
Stock Issued During Period, Shares, Cashless Exercise of Options (in shares)                                     265,800    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                                       $ 0.3  
Equity Incentive Plan 2007 [Member]                                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)                           10 years              
Non Plan [Member]                                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                                     444,921 85,251  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)                                       463,882  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                                     $ 0.19 $ 0.23  
Share-Based Payment Arrangement, Option [Member] | 2024 Equity Incentive Plan [Member]                                          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount 760,000                                   $ 760,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                                     4 years    
Share-Based Payment Arrangement, Option [Member] | Non Plan [Member]                                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                                     444,921 85,251  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                                     $ 72,000 $ 18,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 39,000                                   $ 39,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                                     2 years    
Share-Based Payment Arrangement, Option [Member] | Non Plan [Member] | Minimum [Member]                                          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                                     $ 0.18 $ 0.23  
Share-Based Payment Arrangement, Option [Member] | Non Plan [Member] | Maximum [Member]                                          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                                     $ 0.28 $ 0.26  
Share-Based Payment Arrangement, Option [Member] | Clyra Medical Technologies [Member]                                          
Share-Based Payment Arrangement, Expense                                     $ 1,203,000 $ 528,000  
Selling, General and Administrative Expenses [Member] | Share-Based Payment Arrangement, Option [Member]                                          
Share-Based Payment Arrangement, Expense                                     $ 2,965,000 $ 2,063,000  
Officer [Member]                                          
Stock Issued During Period, Shares, Issued for Services (in shares) 808,908 177,235   11,250     16,579 41,087             350,751   0 0 1,348,144 57,666  
Stock Issued During Period, Value, Issued for Services $ 134,000 $ 30,000 $ 70,000 $ 3,000     $ 4,000 $ 9,000                     $ 237,000 $ 13,000  
Shares Issued, Price Per Share (in dollars per share) $ 0.18 $ 0.17 $ 0.21 $ 0.28     $ 0.19 $ 0.23             $ 0.21 $ 0.28     $ 0.18 $ 0.19  
Consultants and Vendors [Member]                                          
Stock Issued During Period, Shares, Issued for Services (in shares) 539,236 147,059 564,252       94,126 219,816   446,989   288,997       209,080     1,459,627 1,049,928  
Stock Issued During Period, Value, Issued for Services $ 94,000 $ 25,000 $ 143,000       $ 18,000 $ 54,000   $ 116,000   $ 83,000       $ 58,000     $ 320,000 $ 271,000  
Shares Issued, Price Per Share (in dollars per share) $ 0.17 $ 0.18 $ 0.25 $ 0.27     $ 0.19 $ 0.23   $ 0.26   $ 0.35     $ 0.25 $ 0.27 $ 0.26 $ 0.35 $ 0.17 $ 0.19  
Board of Directors, Employees, and Consultants [Member] | 2024 Equity Incentive Plan [Member]                                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                                     11,299,094    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                                     $ 1,925,000    
Board of Directors, Employees, and Consultants [Member] | 2024 Equity Incentive Plan [Member] | Minimum [Member]                                          
Share Price (in dollars per share) 0.17                                   $ 0.17    
Board of Directors, Employees, and Consultants [Member] | 2024 Equity Incentive Plan [Member] | Maximum [Member]                                          
Share Price (in dollars per share) $ 0.28                                   $ 0.28    
Board of Directors, Employees, and Consultants [Member] | 2018 Equity Incentive Plan [Member]                                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                                       1,547,938  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                                       $ 418,000  
Board of Directors, Employees, and Consultants [Member] | Replacement Options [Member] | 2018 Equity Incentive Plan [Member]                                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                                       544,841  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                                       $ 160,000  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                                       $ 0.35  
Director [Member] | 2024 Equity Incentive Plan [Member]                                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                                     1,750,369    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                                     $ 311,000    
Director [Member] | 2018 Equity Incentive Plan [Member]                                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                                       267,746  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                                       $ 85,000  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                                       $ 0.35  
Employees [Member] | Employee Retention Program [Member] | 2024 Equity Incentive Plan [Member]                                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                                     4,182,205    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                                     $ 730,000    
Employees [Member] | Employee Retention Program [Member] | 2018 Equity Incentive Plan [Member]                                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                                       735,351  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                                       $ 173,000  
Employees [Member] | Employee Retention Program [Member] | 2018 Equity Incentive Plan [Member] | Minimum [Member]                                          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                                       $ 0.17  
Employees [Member] | Employee Retention Program [Member] | 2018 Equity Incentive Plan [Member] | Maximum [Member]                                          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                                       $ 0.35  
Consultants [Member] | 2024 Equity Incentive Plan [Member]                                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                                     5,066,520    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                                     $ 817,000    
Chief Financial Officer [Member] | 2024 Equity Incentive Plan [Member]                                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                                     300,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                                     $ 67,000    
Chief Financial Officer [Member] | Share-Based Payment Arrangement, Option [Member]                                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)         10 years       10 years                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)         300,000       300,000                        
Engagement Extension, Term (Year)         1 year       1 year                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross, Per Month (in shares)         25,000       25,000                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in dollars per share)         $ 0.2536       $ 0.24                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Available Grants in Period, Gross, Upon Renewal (in shares)                 300,000                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vesting Period for Renewable Options (Year)                 1 year