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Note 6 - Commitments and Contingencies (Tables)
 9 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
Balance at July 1, 2016
  $
566
  
Warranties issued during the period
    
81
  
Settlements made during the period
    
(74
 )
Changes in liability for pre-existing warranties during the period
    
(36
 )
Balance at March 31, 2017
   $
537