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Note 5 - Stockholders' Equity (Tables)
6 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Number of Shares
   
Weighted- Average Exercise Price
   
Weighted- Average Remaining Contractual Life
   
Aggregate Intrinsic
Value
 
                                 
Outstanding at June 30, 2015
    2,952,062     $ 1.28                  
                                 
Granted
    745,500     $ 0.63                  
Forfeited
    (657,062 )   $ 1.43                  
Expired
    (103,750 )   $ 2.05                  
                                 
Outstanding at December 31, 2015
    2,936,750     $ 1.05       5.5       --  
                                 
Vested and Expected to Vest at December 31, 2015
    2,510,927     $ 1.06       5.4       --  
                                 
Exercisable at December 31, 2015
    1,364,690     $ 1.19       4.7       --  
Schedule of Assumptions Used [Table Text Block]
Expected life (years)
    5  
Risk-free interest rate
    1.5 %
Expected volatility
    77 %
Dividend yield
    0 %
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
           
Weighted Average
 
   
Number of Shares
   
Grant Date Fair Value
 
Balance at June 30, 2015
    1,451,784     $ 1.12  
Granted
    --          
Vested
    (30,000 )   $ 0.88  
Forfeited
    (224,712 )   $ 2.05  
Outstanding at December 31, 2015
    1,197,072     $ 0.95  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   
Number of Shares
   
Weighted-Average Exercise Price Per Share
 
Beginning balance
    5,052,400     $ 2.21  
Warrants granted
    34,191,176     $ 0.68  
Warrants canceled
    --       --  
Warrants exercised
    (503,696 )   $ 0.68  
Outstanding at December 31, 2015
    38,739,880     $ 0.88  
Exercisable at December 31, 2015
    17,085,468     $ 1.13