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Note 12 - Equity Transactions and Stock-based Compensation (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Aug. 31, 2024
Jun. 30, 2024
Jun. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)   6,351,818  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   782,500 527,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)   $ 0.27 $ 0.42
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value   $ 129,000 $ 461,000
Director [Member] | Subsequent Event [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 200,000    
Each Director [Member] | Subsequent Event [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 50,000    
Maximum [Member] | Director [Member] | Subsequent Event [Member]      
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) $ 0.2    
Minimum [Member] | Director [Member] | Subsequent Event [Member]      
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) $ 0.18    
Share-Based Payment Arrangement, Option [Member]      
Share-Based Payment Arrangement, Expense   252,000 $ 320,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 205  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   2 years 6 months  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   2,101,683 4,376,284
Share-Based Payment Arrangement, Option [Member] | Director [Member] | Subsequent Event [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 1 year    
Share-Based Payment Arrangement, Option [Member] | Director [Member] | Subsequent Event [Member] | Share-Based Payment Arrangement, Tranche One [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage 25.00%    
Share-Based Payment Arrangement, Option [Member] | Director [Member] | Subsequent Event [Member] | Share-Based Payment Arrangement, Tranche Four [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage 25.00%    
Share-Based Payment Arrangement, Option [Member] | Director [Member] | Subsequent Event [Member] | Share-Based Payment Arrangement, Tranche Three [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage 25.00%    
Share-Based Payment Arrangement, Option [Member] | Director [Member] | Subsequent Event [Member] | Share-Based Payment Arrangement, Tranche Two [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage 25.00%    
Share-Based Payment Arrangement, Option [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years  
Share-Based Payment Arrangement, Option [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   5 years  
Stock Option 2001 Plan [Member]      
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Originally Authorized (in shares)   7,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)   6,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   13,000,000  
Stock Option 1997 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   5,000,000  
Stock Option 2024 Plan [Member] | Officers and Employees [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   592,500  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   582,500  
Stock Option 2024 Plan [Member] | Non-executive Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   200,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   200,000  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)   $ 0.33  
Stock Option 2024 Plan [Member] | Maximum [Member] | Officers and Employees [Member]      
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)   0.26  
Stock Option 2024 Plan [Member] | Minimum [Member] | Officers and Employees [Member]      
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)   $ 0.24  
Stock Option 2024 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Officers and Employees [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years  
Stock Option 2024 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Non-executive Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   1 year  
Stock Option Plan 2023 [Member] | Director [Member]      
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)     $ 0.33
Stock Option Plan 2023 [Member] | Officers, Employees, and Directors [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     738,500
Stock Option Plan 2023 [Member] | Officer [Member]      
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)     $ 0.41
Stock Option Plan 2023 [Member] | Employees [Member]      
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)     $ 0.45
Stock Option Plan 2023 [Member] | Share-Based Payment Arrangement, Option [Member] | Maximum [Member] | Officers, Employees, and Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     3 years
Stock Option Plan 2023 [Member] | Share-Based Payment Arrangement, Option [Member] | Minimum [Member] | Officers, Employees, and Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   5 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     1 year