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INCOME TAXES - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Deferred tax assets: |  |
Inventory | $ 85 | $ 102
Accrued compensation and vacation | 137 | 162
Accrued expenses and other | 172 | 379
Domestic net operating loss carryforwards | 3,580 | 3,282
Basic difference for intangible assets | 457 | 254
Stock compensation expense | 96 | 2
AMT credit carryover | 0 | 31
Leases | 108 | 0
PPP loan expenses | 1,276 | 0
Total deferred tax assets | 5,911 | 4,212
Deferred tax liabilities: |  |
Prepaid expenses | (143) | (121)
Basis difference for fixed assets | (211) | (219)
Goodwill | (141) | 0
Total deferred tax liabilities | (495) | (340)
Total net deferred tax assets | 5,416 | 3,872
Valuation allowance for net deferred tax assets | (5,557) | (3,841)
Net deferred tax asset (liability) | $ (141) |
Net deferred tax asset (liability) |  | $ 31

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