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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
Nov. 30, 2020
Jun. 30, 2022
Jun. 30, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)   6,807,069  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   764,700 770,000
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share)   $ 0.09  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)   $ 0.85 $ 0.66
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years  
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, Options, Exercisable, Intrinsic Value   $ 1,002 $ 2,825
Director [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 770,000 764,700  
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share) $ 0.65 $ 0.51  
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share) $ 0.72    
Share-Based Payment Arrangement, Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   537,600 0
Share-Based Payment Arrangement, Option [Member] | Director [Member] | Share-Based Payment Arrangement, Tranche One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 1 year    
Share-Based Payment Arrangement, Option [Member] | Director [Member] | Share-Based Payment Arrangement, Tranche Two [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years    
Share-Based Payment Arrangement, Option [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)   $ 1.045  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years  
Share-Based Payment Arrangement, Expense   $ 369 $ 231
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] | Maximum [Member] | Director [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  
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 Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   1 year  
Share-Based Payment Arrangement, Option [Member] | Minimum [Member] | Director [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