Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Deferred tax assets - current:
Capitalized inventory costs	$ 230,000	$ 130,000	$ 90,000
Inventory write-downs	950,000	620,000	600,000
Accrued warranty	180,000	200,000	20,000
Deferred profits	1,460,000	800,000	2,510,000
Accruals and reserves not currently deductible	520,000	490,000	240,000
Deferred tax assets - current	3,340,000	2,240,000	3,460,000
Valuation allowance	(2,280,000)	(910,000)	0
Deferred tax assets - current	1,060,000	1,330,000	3,460,000
Deferred tax assets (liabilities)- non-current:
Stock option expense	670,000	700,000	470,000
Book vs. tax basis of acquired assets	(1,210,000)	(1,130,000)	(1,280,000)
Federal net operating loss caryforwards	900,000	0	0
Foreign and state net operating losses	8,070,000	9,000,000	3,640,000
Book vs. tax depreciation and amortization	(10,000)	60,000	100,000
Foreign tax credits	0	520,000	0
Other deferred tax assets	2,950,000	(350,000)	140,000
Total deferred tax assets - non-current	11,370,000	8,800,000	3,070,000
Valuation allowance	(10,070,000)	(7,540,000)	(2,600,000)
Deferred tax assets (liabilities) - non-current, net of valuation allowance	$ 1,300,000	$ 1,260,000	$ 470,000