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INCOME TAXES - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Deferred tax assets: |  |
Inventory | $ 102 | $ 101
Accrued compensation and vacation | 162 | 68
Accrued expenses and other | 379 | 277
Domestic net operating loss carryforwards | 3,282 | 3,328
Basic difference for intangible assets | 254 | 114
Stock compensation expense | 2 | 5
AMT credit carryover | 31 | 62
Total deferred tax assets | 4,212 | 3,955
Deferred tax liabilities: |  |
Prepaid expenses | (121) | (60)
Basis difference for fixed assets | (219) | (280)
Total deferred tax liabilities | (340) | (340)
Total net deferred tax assets | 3,872 | 3,615
Valuation allowance for net deferred tax assets | (3,841) | (3,553)
Net deferred tax asset | $ 31 | $ 62

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