Note 10 - Income Taxes (Tables)
 12 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
2016
    
2015
  
Statutory federal income tax benefit
   $ (6,300 )   $ (5,046 )
                 
Unbenefited net operating losses and credits
     3,391       5,091  
Disallowed financing costs
     2,607       --  
State and local taxes
     69       (33 )
Other
     233       (12 )
                 
Total income tax expense
   $ --     $ --  
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
   
June 30, 2016
    
June 30, 2015
  
Deferred tax assets:
                
Net operating loss carryforwards
   $ 41,023     $ 38,317  
Income tax credit carryforwards
     2,367       2,143  
Stock compensation
     874       916  
Other
     1,345       1,479  
Valuation allowance
     (45,892 )     (42,408 )
Total deferred taxes
     (283 )     447  
                 
Deferred tax liabilities
                
Depreciation and amortization
     (7,358 )     (8,088 )
Net deferred taxes and liabilities
   $ (7,641 )   $ (7,641 )