INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Stock-based compensation	$ 211	$ 261
AMT and research and development credits	490	517
Inventory	98	158
Professional fees	175	124
Deferred tax assets related to other items	140	109
Net operating loss carryforwards	1,016	1,067
Total deferred tax assets	2,130	2,236
Deferred tax liabilities related to depreciable and amortizable assets	(836)	(728)
Deferred tax liabilities related to other items	(42)	(63)
Net deferred tax assets before valuation allowance	1,252	1,445
Valuation allowance	0	(1,688)
Net deferred tax (liability) asset	$ 1,252
Net deferred tax (liability) asset		$ (243)