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Components of Net Deferred Income Tax Asset (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Deferred income tax assets: |  |
Allowance for doubtful accounts | $ 2,816 | $ 192
Inventories | 7,842 | 7,731
Loss and tax credit carry-forwards | 22,027 | 22,377
Stock-based compensation | 506 | 691
Accrued product warranty | 54 | 47
Accrued compensated absences | 328 | 313
Property and equipment | 501 | 462
Prepaid income taxes | 517 | 753
Other reserves | 1,018 | 21
Deferred Tax Assets, Gross, Total | 35,609 | 32,587
Deferred income tax liabilities: |  |
Allowance for doubtful accounts | (11) |
Intangible assets | (960) | (1,391)
Property, plant and equipment and other | (3,302) | (4,978)
Subtotal deferred income tax assets | 31,336 | 26,218
Valuation allowance | (31,363) | (26,033)
Net deferred income tax assets (liabilities) |  | 185
Net deferred income tax assets (liabilities) | (27) |
U.S. |  |
Deferred income tax assets: |  |
Allowance for doubtful accounts | 2,813 | 189
Inventories | 7,809 | 7,652
Loss and tax credit carry-forwards | 17,431 | 18,156
Stock-based compensation | 506 | 691
Accrued product warranty | 52 | 43
Accrued compensated absences | 328 | 313
Other reserves | 1,009 | 13
Deferred Tax Assets, Gross, Total | 29,948 | 27,057
Deferred income tax liabilities: |  |
Intangible assets | (960) | (1,386)
Property, plant and equipment and other | (3,271) | (4,919)
Subtotal deferred income tax assets | 25,717 | 20,752
Valuation allowance | (25,717) | (20,752)
Non U.S. |  |
Deferred income tax assets: |  |
Allowance for doubtful accounts | 3 | 3
Inventories | 33 | 79
Loss and tax credit carry-forwards | 4,596 | 4,221
Accrued product warranty | 2 | 4
Property and equipment | 501 | 462
Prepaid income taxes | 517 | 753
Other reserves | 9 | 8
Deferred Tax Assets, Gross, Total | 5,661 | 5,530
Deferred income tax liabilities: |  |
Allowance for doubtful accounts | (11) |
Intangible assets |  | (5)
Property, plant and equipment and other | (31) | (59)
Subtotal deferred income tax assets | 5,619 | 5,466
Valuation allowance | (5,646) | (5,281)
Net deferred income tax assets (liabilities) |  | $ 185
Net deferred income tax assets (liabilities) | $ (27) |

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