INCOME TAXES (Deferred tax assets and liabilities for federal and state income taxes) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Deferred tax assets:
Federal & State NOL carryforward	$ 23	$ 23
Research & other credits	347	1,517
Reserves and accruals	431	438
Stock based compensation	9	55
Inventory	357	371
Other intangibles	37	70
Other	147	48
Total gross deferred tax assets	1,351	2,522
Less: valuation allowance	(477)	(368)
Total deferred tax assets	874	2,154
Deferred tax liabilities:
Property and equipment, principally due to differing depreciation methods	(527)	(318)
Deferred state tax	(81)	(152)
Other	(6)	(6)
Total gross deferred tax liabilities	(614)	(476)
Net deferred tax assets	$ 260	$ 1,678