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Note 5 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jan. 31, 2025
Aug. 13, 2024
Jun. 22, 2018
Sep. 07, 2017
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Stock Issued During Period, Value, Issued for Services         $ 55,000 $ 212,000 $ 61,000 $ 63,000 $ 116,000 $ 83,000    
Share Price (in dollars per share)         $ 0.17           $ 0.17  
Proceeds from Issuance of Common Stock                       $ 349,000
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)                     2,000,000  
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)         27,520,544           27,520,544  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                     8,985,536 3,482,270
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                     $ 0.21 $ 0.25
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      
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         $ 382,000           $ 382,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                     2 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)                     32,143 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)                     $ 0.28 $ 0.23
Share-Based Payment Arrangement, Option [Member] | 2024 Equity Incentive Plan [Member]                        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount         735,000           $ 735,000  
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)                     32,143 85,251
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                     $ 8,000 $ 18,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount         55,000           $ 55,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                     1 year  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                     $ 0.28  
Proceeds from Issuance of Common Stock                       $ 153,000
Stock Issued During Period, Shares, New Issues (in shares)                       463,882
Share-Based Payment Arrangement, Option [Member] | Clyra Medical Technologies [Member]                        
Share-Based Payment Arrangement, Expense         193,000     43,000     $ 599,000 $ 165,000
Share-Based Payment Arrangement, Option [Member] | Selling, General and Administrative Expenses [Member]                        
Share-Based Payment Arrangement, Expense         $ 844,000     $ 237,000     $ 1,951,000 $ 1,264,000
Officer [Member]                        
Stock Issued During Period, Shares, Issued for Services (in shares)         177,235 350,751 11,250 41,087 0 0    
Shares Issued, Price Per Share (in dollars per share)         $ 0.17 $ 0.21 $ 0.28 $ 0.23     $ 0.17 $ 0.23
Stock Issued During Period, Value, Issued for Services         $ 30,000 $ 70,000 $ 3,000 $ 9,000        
Consultants and Vendors [Member]                        
Stock Issued During Period, Shares, Issued for Services (in shares)         147,059 564,252 209,080 219,816 446,989 288,997    
Shares Issued, Price Per Share (in dollars per share)         $ 0.17 $ 0.21 $ 0.28 $ 0.23 $ 0.26 $ 0.35 $ 0.17 $ 0.23
Stock Issued During Period, Value, Issued for Services         $ 25,000 $ 143,000 $ 58,000 $ 54,000 $ 116,000 $ 83,000    
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)                     8,985,536 3,482,270
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                     $ 1,577,000 $ 782,000
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                       $ 173,000
Director [Member] | 2024 Equity Incentive Plan [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                     1,241,688 771,180
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                     $ 235,000 $ 171,000
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
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)                     4,907,811 1,013,474
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                     $ 793,000 $ 154,000
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                       $ 160,000
Consultants [Member] | 2024 Equity Incentive Plan [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                     2,536,037 697,616
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                     $ 482,000 $ 223,000
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 1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                     $ 67,000 $ 234,000
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