Components of Net Deferred Income Tax Asset (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Deferred income tax assets:
Allowance for doubtful accounts	$ 287	$ 124
Inventories	4,910	4,691
Net operating loss carry-forwards, tax credits and deferrals	871	1,204
Stock-based compensation	1,658	298
Accrued product warranty	325	666
Accrued compensated absences	579	549
Comprehensive income	1,344	573
Insurance and other reserves	1,119	1,036
Deferred Tax Assets, Gross, Total	11,093	9,141
Deferred income tax liabilities:
Intangible assets	(285)	(230)
Property, plant and equipment and other	(5,889)	(3,870)
Subtotal deferred income tax asset	4,919	5,041
Valuation allowance	0	0
Net deferred income tax asset	4,919	5,041
U. S.
Deferred income tax assets:
Allowance for doubtful accounts	214	120
Inventories	5,035	4,762
Stock-based compensation	1,658	298
Accrued product warranty	317	644
Accrued compensated absences	579	549
Comprehensive income	1,344	573
Insurance and other reserves	1,088	973
Deferred Tax Assets, Gross, Total	10,235	7,919
Deferred income tax liabilities:
Intangible assets	(285)	(230)
Property, plant and equipment and other	(4,768)	(3,238)
Subtotal deferred income tax asset	5,182	4,451
Valuation allowance	0	0
Net deferred income tax asset	5,182	4,451
Non U. S.
Deferred income tax assets:
Allowance for doubtful accounts	73	4
Inventories	(125)	(71)
Net operating loss carry-forwards, tax credits and deferrals	871	1,204
Accrued product warranty	8	22
Insurance and other reserves	31	63
Deferred Tax Assets, Gross, Total	858	1,222
Deferred income tax liabilities:
Property, plant and equipment and other	(1,121)	(632)
Subtotal deferred income tax asset	(263)	590
Valuation allowance	0	0
Net deferred income tax asset	$ (263)	$ 590