Components of Net Deferred Income Tax Asset (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Deferred income tax assets:
Allowance for doubtful accounts	$ 702	$ 287
Inventories	4,316	4,910
Net operating loss carry-forwards, tax credits and deferrals	2,270	871
Stock-based compensation	1,690	1,658
Accrued product warranty	809	325
Accrued compensated absences	520	579
Currency translation adjustments	101	1,344
Insurance and other reserves	105	1,119
Deferred Tax Assets, Gross, Total	10,513	11,093
Deferred income tax liabilities:
Intangible assets	31	(285)
Property, plant and equipment and other	(6,034)	(5,889)
Subtotal deferred income tax assets	4,510	4,919
Valuation allowance	0	0
Net deferred income tax assets	4,510	4,919
U. S.
Deferred income tax assets:
Allowance for doubtful accounts	681	214
Inventories	4,350	5,035
Stock-based compensation	1,690	1,658
Accrued product warranty	803	317
Accrued compensated absences	520	579
Currency translation adjustments	101	1,344
Insurance and other reserves	62	1,088
Deferred Tax Assets, Gross, Total	8,207	10,235
Deferred income tax liabilities:
Intangible assets	31	(285)
Property, plant and equipment and other	(5,264)	(4,768)
Subtotal deferred income tax assets	2,974	5,182
Valuation allowance	0	0
Net deferred income tax assets	2,974	5,182
Non U. S.
Deferred income tax assets:
Allowance for doubtful accounts	21	73
Inventories	(34)	(125)
Net operating loss carry-forwards, tax credits and deferrals	2,270	871
Accrued product warranty	6	8
Insurance and other reserves	43	31
Deferred Tax Assets, Gross, Total	2,306	858
Deferred income tax liabilities:
Property, plant and equipment and other	(770)	(1,121)
Subtotal deferred income tax assets	1,536	(263)
Valuation allowance	0	0
Net deferred income tax assets	$ 1,536	$ (263)