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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, 2017
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   2,718,183 2,870,950 3,072,950
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, Award Vesting Period   3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   4,341,486    
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   $ 3.36    
Allocated Share-based Compensation Expense   $ 49 $ 31  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options   $ 15    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value   $ 194 $ 31  
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 50,000      
Non-officer Directors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value $ 34      
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 Period 210 days      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 58.00%      
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   $ 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