Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Deferred tax assets - current:
Capitalized inventory costs	$ 340,000	$ 230,000	$ 130,000
Inventory write-downs	4,840,000	950,000	620,000
Accrued warranty	280,000	180,000	200,000
Deferred profits	1,180,000	1,460,000	800,000
Accruals and reserves not currently deductible	1,920,000	520,000	490,000
Deferred tax assets - current	8,560,000	3,340,000	2,240,000
Valuation allowance	(6,510,000)	(2,280,000)	(910,000)
Deferred tax assets - current	2,050,000	1,060,000	1,330,000
Deferred tax assets (liabilities)- non-current:
Stock option expense	680,000	670,000	700,000
Book vs. tax basis of acquired assets	(1,350,000)	(1,210,000)	(1,130,000)
Federal net operating loss caryforwards	5,570,000	900,000	0
Foreign and state net operating losses	10,550,000	8,070,000	9,000,000
Book vs. tax depreciation and amortization	(2,030,000)	(10,000)	60,000
Foreign tax credits	3,950,000	0	520,000
Other deferred tax assets	360,000	2,950,000	(350,000)
Total deferred tax assets - non-current	17,730,000	11,370,000	8,800,000
Valuation allowance	(17,300,000)	(10,070,000)	(7,540,000)
Deferred tax assets (liabilities) - non-current, net of valuation allowance	$ 430,000	$ 1,300,000	$ 1,260,000