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Note 5 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jan. 31, 2025
Aug. 13, 2024
Jun. 22, 2018
Sep. 07, 2017
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Stock Issued During Period, Value, Issued for Services         $ 212,000 $ 61,000 $ 116,000 $ 83,000    
Share Price (in dollars per share)         $ 0.21       $ 0.21  
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)         32,715,733       32,715,733  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)           3,790,347   1,829,757    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)           $ 0.24   $ 0.26    
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         $ 435,000       $ 435,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                 4 years  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)         566,951     497,024 566,951  
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   15,686    
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   $ 0.26    
Share-Based Payment Arrangement, Option [Member] | 2024 Equity Incentive Plan [Member]                    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount         $ 438,000       $ 438,000  
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 15,686
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                 $ 8,000 $ 4,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount         55,000   $ 109,000   $ 55,000 $ 109,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                 1 year 4 years
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
Proceeds from Issuance of Common Stock             $ 85,000      
Stock Issued During Period, Shares, New Issues (in shares)             497,024      
Share-Based Payment Arrangement, Option [Member] | Clyra Medical Technologies [Member]                    
Share-Based Payment Arrangement, Expense         200,000   $ 63,000   $ 406,000 $ 122,000
Share-Based Payment Arrangement, Option [Member] | Selling, General and Administrative Expenses [Member]                    
Share-Based Payment Arrangement, Expense         $ 492,000   $ 539,000   $ 1,107,000 $ 1,027,000
Officer [Member]                    
Stock Issued During Period, Shares, Issued for Services (in shares)         350,751 11,250   0    
Shares Issued, Price Per Share (in dollars per share)         $ 0.21 $ 0.28     $ 0.21  
Stock Issued During Period, Value, Issued for Services         $ 70,000 $ 3,000        
Consultants [Member]                    
Stock Issued During Period, Shares, Issued for Services (in shares)         564,252 209,080 446,989 288,997    
Shares Issued, Price Per Share (in dollars per share)         $ 0.21 $ 0.28 $ 0.26 $ 0.35 $ 0.21 $ 0.26
Stock Issued During Period, Value, Issued for Services         $ 143,000 $ 58,000 $ 116,000 $ 83,000    
Consultants [Member] | 2024 Equity Incentive Plan [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                 1,508,203 338,241
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                 $ 328,000 $ 77,000
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)                 3,790,347 1,829,757
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                 $ 816,000 $ 428,000
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)                 822,571 367,648
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                 $ 172,000 $ 84,000
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)                 1,159,573 423,868
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                 $ 249,000 $ 98,000
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    
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)                 300,000 700,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                 $ 67,000 $ 169,000
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