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Components of Net Deferred Income Tax Asset (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | --- | ---
Deferred income tax assets: |  |  |
Allowance for doubtful accounts | $ 784 | $ 766 | $ 702
Inventories | 11,265 | 5,110 | 4,316
Net operating loss carry-forwards, tax credits and deferrals | 16,293 | 6,823 | 2,270
Stock-based compensation | 2,147 | 1,905 | 1,690
Accrued product warranty | 176 | 134 | 809
Accrued compensated absences | 419 | 467 | 520
Property and equipment | 430 |  | 101
Insurance and other reserves | 134 | 170 | 105
Deferred Tax Assets, Gross, Total | 31,648 | 15,375 | 10,513
Deferred income tax liabilities: |  |  |
Allowance for doubtful accounts | (9) |  | 31
Property, plant and equipment and other | (3,158) | (7,481) | (6,034)
Subtotal deferred income tax assets | 28,481 | 7,894 | 4,510
Valuation allowance | (28,259) | (7,715) | 0
Net deferred income tax assets | 222 | 179 | 4,510
U. S. |  |  |
Deferred income tax assets: |  |  |
Allowance for doubtful accounts | 777 | 715 | 681
Inventories | 11,215 | 5,089 | 4,350
Net operating loss carry-forwards, tax credits and deferrals | 11,803 | 3,000 |
Stock-based compensation | 2,147 | 1,905 | 1,690
Accrued product warranty | 174 | 130 | 803
Accrued compensated absences | 419 | 467 | 520
Property and equipment |  |  | 101
Insurance and other reserves | 127 | 170 | 62
Deferred Tax Assets, Gross, Total | 26,662 | 11,476 | 8,207
Deferred income tax liabilities: |  |  |
Allowance for doubtful accounts |  |  | 31
Property, plant and equipment and other | (3,087) | (7,470) | (5,264)
Subtotal deferred income tax assets | 23,575 | 4,006 | 2,974
Valuation allowance | (23,575) | (4,006) | 0
Net deferred income tax assets |  |  | 2,974
Non U. S. |  |  |
Deferred income tax assets: |  |  |
Allowance for doubtful accounts | 7 | 51 | 21
Inventories | 50 | 21 | (34)
Net operating loss carry-forwards, tax credits and deferrals | 4,490 | 3,823 | 2,270
Accrued product warranty | 2 | 4 | 6
Property and equipment | 430 |  |
Insurance and other reserves | 7 |  | 43
Deferred Tax Assets, Gross, Total | 4,986 | 3,899 | 2,306
Deferred income tax liabilities: |  |  |
Allowance for doubtful accounts | (9) |  |
Property, plant and equipment and other | (71) | (11) | (770)
Subtotal deferred income tax assets | 4,906 | 3,888 | 1,536
Valuation allowance | (4,684) | (3,709) | 0
Net deferred income tax assets | $ 222 | $ 179 | $ 1,536

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