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Note 4 - Commitments and Contingencies (Tables)
 6 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
Balance at July 1, 2016
  $
566
  
Warranties issued during the period
    
59
  
Settlements made during the period
    
(67
 )
Changes in liability for pre-existing warranties during the period
    
(5
 )
Balance at December 31, 2016
   $
553