Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Deferred tax assets - current:
Capitalized inventory costs	$ 130	$ 90	$ 150
Inventory write-downs	620	600	590
Accrued warranty	200	20	(580)
Deferred profits	800	2,510	6,820
Accruals and reserves not currently deductible	490	240	2,580
Deferred tax assets - current	1,330	3,460	9,560
Valuation allowance	(910)	0	0
Deferred Tax Assets, Gross, Current	2,240	3,460	9,560
Deferred tax assets (liabilities)- non-current:
Stock option expense	700	470	270
Book vs. tax basis of acquired assets	(1,130)	(1,280)	(760)
Foreign and state net operating losses	9,000	3,640	850
Book vs. tax depreciation and amortization	60	100	300
Foreign tax credits	520	0	0
Other deferred tax assets	(350)	140	90
Total deferred tax assets - non-current	8,800	3,070	750
Valuation allowance	(7,540)	(2,600)	(860)
Deferred tax assets (liabilities) - non-current, net of valuation allowance	$ 1,260	$ 470	$ (110)