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Components of Net Deferred Income Tax Asset (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Deferred income tax assets: |  |
Allowance for doubtful accounts | $ 553 | $ 784
Inventories | 6,938 | 11,265
Loss and tax credit carry-forwards | 21,207 | 16,293
Stock-based compensation | 614 | 2,147
Accrued product warranty | 144 | 176
Accrued compensated absences | 259 | 419
Property and equipment | 457 | 430
Prepaid income taxes | 714 |
Other reserves | 62 | 134
Deferred Tax Assets, Gross, Total | 30,948 | 31,648
Deferred income tax liabilities: |  |
Allowance for doubtful accounts | (6) | (9)
Intangible assets | (1,681) |
Property, plant and equipment and other | (3,681) | (3,158)
Subtotal deferred income tax assets | 25,580 | 28,481
Valuation allowance | (25,379) | (28,259)
Net deferred income tax assets | 201 | 222
U. S. |  |
Deferred income tax assets: |  |
Allowance for doubtful accounts | 545 | 777
Inventories | 6,870 | 11,215
Loss and tax credit carry-forwards | 17,056 | 11,803
Stock-based compensation | 614 | 2,147
Accrued product warranty | 136 | 174
Accrued compensated absences | 259 | 419
Prepaid income taxes | 714 |
Other reserves | 56 | 127
Deferred Tax Assets, Gross, Total | 26,250 | 26,662
Deferred income tax liabilities: |  |
Intangible assets | (1,681) |
Property, plant and equipment and other | (3,622) | (3,087)
Subtotal deferred income tax assets | 20,947 | 23,575
Valuation allowance | (20,931) | (23,575)
Net deferred income tax assets | 16 |
Non U. S. |  |
Deferred income tax assets: |  |
Allowance for doubtful accounts | 8 | 7
Inventories | 68 | 50
Loss and tax credit carry-forwards | 4,151 | 4,490
Accrued product warranty | 8 | 2
Property and equipment | 457 | 430
Other reserves | 6 | 7
Deferred Tax Assets, Gross, Total | 4,698 | 4,986
Deferred income tax liabilities: |  |
Allowance for doubtful accounts | (6) | (9)
Property, plant and equipment and other | (59) | (71)
Subtotal deferred income tax assets | 4,633 | 4,906
Valuation allowance | (4,448) | (4,684)
Net deferred income tax assets | $ 185 | $ 222

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