INCOME TAXES (Deferred tax assets and liabilities for federal and state income taxes) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Deferred tax assets:
Federal & State NOL carryforward	$ 23	$ 181
Research & other credits	1,517	1,832
Reserves and accruals	438	180
Stock based compensation	55
Inventory	371	446
Other intangibles	70	178
Goodwill		77
Other	48	1
Total gross deferred tax assets	2,522	2,895
Less: valuation allowance	(368)	(89)
Total deferred tax assets	2,154	2,806
Deferred tax liabilities:
Property and equipment, principally due to differing depreciation methods	(318)	(438)
Deferred state tax	(152)	(295)
Other intangibles		(2)
Other	(6)	(23)
Total gross deferred tax liabilities	(476)	(758)
Net deferred tax assets	$ 1,678	$ 2,048