Note 7 - Commitments and Contingencies (Tables)
 12 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
2017
     428  
2018
     305  
2019
     260  
Total
   $ 993  
Schedule of Product Warranty Liability [Table Text Block]
   
For years ended June 30,
  
   
2016
    
2015
  
Beginning balance
   $ 627     $ 498  
Warranties issued during the period
     97       258  
Settlements made during the period
     (287 )     (168 )
Changes in liability for pre-existing warranties during the period
     129       39  
Ending balance
   $ 566     $ 627