Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Deferred tax assets - current:
Capitalized inventory costs	$ 90	$ 150	$ 470
Inventory write-downs	600	590	820
Accrued Warranty	20	(580)	370
Deferred profits	2,510	6,820	(180)
Accruals and reserves not currently deductible	240	2,580	650
Deferred tax assets - current net of valuation allowance	3,460	9,560	2,130
Deferred tax assets (liabilities)- non-current:
Stock option expense	470	270	430
Book vs. tax basis of acquired assets	(1,280)	(760)	(670)
Foreign and state net operating losses	3,640	850	380
Book vs. tax depreciation and amortization	100	300	350
Foreign tax credits	0	0	2,540
Other deferred tax assets	140	90	20
Total deferred tax assets - net	3,070	750	3,050
Valuation allowance	(2,600)	(860)	(390)	(300)
Deferred tax assets (liabilities)- non-current, net of valuation allowance	$ 470	$ (110)	$ 2,660