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Note 12 - Equity Transactions and Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2023
Nov. 30, 2020
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)       6,823,569  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     527,000 764,700  
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share)     $ 0.09    
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share)     1.05    
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, Outstanding, Weighted Average Exercise Price (in dollars per share)     0.35 $ 0.36 $ 0.26
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)     $ 0.42 $ 0.85  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value     $ 461 $ 1,002  
Director [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     764,700    
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share)     $ 0.51    
Maximum [Member] | Director [Member]          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)     1.045    
Minimum [Member] | Director [Member]          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)     $ 0.95    
Share-Based Payment Arrangement, Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     3 years    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)     4,376,284 537,600  
Share-Based Payment Arrangement, Option [Member] | Subsequent Event [Member] | Director [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, Award Vesting Period (Year) 1 year        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) $ 0.33        
Share-Based Payment Arrangement, Option [Member] | Subsequent Event [Member] | Director [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] | Subsequent Event [Member] | Each Director [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 50,000        
Share-Based Payment Arrangement, Option [Member] | Maximum [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, Award Vesting Period (Year)       3 years  
Share-Based Payment Arrangement, Expense       $ 369  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 480  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       2 years 6 months  
Share-Based Payment Arrangement, Option [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   5 years   5 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       1 year  
Share-Based Payment Arrangement, Expense     $ 320    
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 2022 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)     538,500    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     527,000    
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share)     $ 0.41    
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share)     $ 0.45