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Warranty Accrual (Schedule of accrual warranty costs) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of year $ 365 $ 261
Accruals during the period 316 350
Change in estimates of prior period accruals (224) (154)
Warranty amortization (298) (92)
Balance at end of year $ 159 $ 365