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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, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
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    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   4,620,419    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   200,000  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit   $ 0.09    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit   $ 0.25    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance   2,439,250 2,718,183 2,870,950
Allocated Share-based Compensation Expense, Total   $ 14 $ 49  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value   $ 180 194  
Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 200,000      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 0.23      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit $ 0.25      
Resigned Optionee [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 50,000      
Employee Stock Option [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years      
Employee Stock Option [Member] | Director [Member] | Share-based Compensation Award, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 42.00%      
Employee Stock Option [Member] | Director [Member] | Share-based Compensation Award, Tranche Two [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 58.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 210 days      
Employee Stock Option [Member] | Resigned Optionee [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 90 days      
Employee Stock Option [Member] | Non-officer Directors [Member]        
Allocated Share-based Compensation Expense, Total     $ 33  
Employee Stock Option [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years    
Employee Stock Option [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   5 years