INCOME TAXES - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Deferred tax assets:
Inventory	$ 117	$ 85
Accrued compensation and vacation	224	137
Accrued expenses and other		172
Domestic net operating loss carryforwards	5,277	3,580
Basis difference for intangible assets	138	457
Goodwill	138	457
Stock compensation expense	501	96
Business Interest Limitation	226
Leases	94	108
PPP loan expenses		1,276
Total deferred tax assets	6,577	5,911
Deferred tax liabilities:
Prepaid expenses	(126)	(143)
Accrued expenses and other	(926)
Basis difference for fixed assets	(2,077)	(211)
Basis difference for intangible assets	(2,841)
Goodwill		(141)
Total deferred tax liabilities	(5,970)	(495)
Total net deferred tax assets	607	5,416
Valuation allowance for net deferred tax assets	(951)	(5,557)
Net deferred tax liability	$ (344)	$ (141)