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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
May 31, 2019
Nov. 30, 2016
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     7,873,169  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     1,883,000
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit     $ 0.09  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
Share-based Payment Arrangement, Expense     $ 144 $ 14
Incremental Common Shares Attributable to Conversion of Debt Securities, Total     8,230,769
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value     $ 256 $ 180
Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 1,883,000      
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit $ 0.21 $ 0.23    
Share-based Payment Arrangement, Option [Member] | Director [Member]        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 131  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     3 years  
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 90 days      
Share-based Payment Arrangement, Option [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years  
Share-based Payment Arrangement, Option [Member] | Maximum [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years      
Share-based Payment Arrangement, Option [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     5 years  
Share-based Payment Arrangement, Option [Member] | Minimum [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years      
Stock Option 2001 Plan [Member]        
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Originally Authorized     7,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized     6,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     13,000,000  
Stock Option 1997 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     5,000,000