ACCOUNTING POLICIES - Warranty Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Rental term	36 years
Advertising expense	$ 400	$ 300	$ 200
Research and development expenses	1,400	1,400	1,500
Interest or penalties related to uncertain tax positions	0	0	$ 0
Deferred Tax Assets, Net, Noncurrent	$ 27,670	27,724
Minimum
Cancellation period	30 days
Term of products warranty	P1Y
Maximum
Cancellation period	60 days
Term of products warranty	P3Y
Adjustments for New Accounting Principle, Early Adoption | Accounting Standards Update 2015-01
Deferred Tax Assets, Current		(2,300)
Deferred Tax Assets, Net, Noncurrent		$ 2,300