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Components of Net Deferred Income Tax Asset (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Deferred income tax assets: |  |
Allowance for doubtful accounts | $ 192 | $ 553
Inventories | 7,731 | 6,938
Loss and tax credit carry-forwards | 22,377 | 21,207
Stock-based compensation | 691 | 614
Accrued product warranty | 47 | 144
Accrued compensated absences | 313 | 259
Property and equipment | 462 | 457
Prepaid income taxes | 753 | 714
Other reserves | 21 | 62
Deferred Tax Assets, Gross, Total | 32,587 | 30,948
Deferred income tax liabilities: |  |
Allowance for doubtful accounts |  | (6)
Intangible assets | (1,391) | (1,681)
Property, plant and equipment and other | (4,978) | (3,681)
Subtotal deferred income tax assets | 26,218 | 25,580
Valuation allowance | (26,033) | (25,379)
Net deferred income tax assets | 185 | 201
U.S. |  |
Deferred income tax assets: |  |
Allowance for doubtful accounts | 189 | 545
Inventories | 7,652 | 6,870
Loss and tax credit carry-forwards | 18,156 | 17,056
Stock-based compensation | 691 | 614
Accrued product warranty | 43 | 136
Accrued compensated absences | 313 | 259
Prepaid income taxes | 753 | 714
Other reserves | 13 | 56
Deferred Tax Assets, Gross, Total | 27,810 | 26,250
Deferred income tax liabilities: |  |
Intangible assets | (1,386) | (1,681)
Property, plant and equipment and other | (4,919) | (3,622)
Subtotal deferred income tax assets | 21,505 | 20,947
Valuation allowance | (21,502) | (20,931)
Net deferred income tax assets | 3 | 16
Non U.S. |  |
Deferred income tax assets: |  |
Allowance for doubtful accounts | 3 | 8
Inventories | 79 | 68
Loss and tax credit carry-forwards | 4,221 | 4,151
Accrued product warranty | 4 | 8
Property and equipment | 462 | 457
Other reserves | 8 | 6
Deferred Tax Assets, Gross, Total | 4,777 | 4,698
Deferred income tax liabilities: |  |
Allowance for doubtful accounts |  | (6)
Intangible assets | (5) |
Property, plant and equipment and other | (59) | (59)
Subtotal deferred income tax assets | 4,713 | 4,633
Valuation allowance | (4,531) | (4,448)
Net deferred income tax assets | $ 182 | $ 185

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