Components of Net Deferred Income Tax Asset (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Deferred income tax assets:
Allowance for doubtful accounts	$ 124	$ 50
Inventories	4,691	4,444
Capitalized research and development costs		89
Property, plant and equipment and other	(632)	1
Net operating loss carryforwards, tax credits and deferrals	1,204	393
Stock-based compensation	298	347
Accrued product warranty	666	799
Accrued compensated absences	549	443
Comprehensive income	573	121
Insurance and other reserves	1,036	965
Deferred Tax Assets, Gross, Total	8,509	7,652
Deferred income tax liabilities:
Allowance for doubtful accounts		(122)
Intangible assets	(230)	(144)
Property, plant and equipment and other	(3,238)	(3,257)
Subtotal deferred income tax asset	5,041	4,129
Valuation allowance		(87)
Net deferred income tax asset	5,041	4,042
U. S.
Deferred income tax assets:
Allowance for doubtful accounts	120	47
Inventories	4,762	4,472
Capitalized research and development costs		89
Stock-based compensation	298	347
Accrued product warranty	644	787
Accrued compensated absences	549	443
Comprehensive income	573	121
Insurance and other reserves	973	938
Deferred Tax Assets, Gross, Total	7,919	7,244
Deferred income tax liabilities:
Intangible assets	(230)	(144)
Property, plant and equipment and other	(3,238)	(3,056)
Subtotal deferred income tax asset	4,451	4,044
Net deferred income tax asset	4,451	4,044
Non U. S.
Deferred income tax assets:
Allowance for doubtful accounts	4	3
Inventories	(71)	(28)
Property, plant and equipment and other	(632)	1
Net operating loss carryforwards, tax credits and deferrals	1,204	393
Accrued product warranty	22	12
Insurance and other reserves	63	27
Deferred Tax Assets, Gross, Total	590	408
Deferred income tax liabilities:
Allowance for doubtful accounts		(122)
Property, plant and equipment and other		(201)
Subtotal deferred income tax asset	590	85
Valuation allowance		(87)
Net deferred income tax asset	$ 590	$ (2)