Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Operating Activities:
Net income (loss)	$ (1,315,304)	$ (253,535)	$ 108,672
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	1,538,102	1,407,963	1,234,081
Amortization	978,953	694,925	692,756
Stock based compensation	1,495,773	1,481,102	1,330,220
Deferred income taxes	(834,412)	(172,627)	196,545
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	652,640	(1,481,287)	(657,793)
Inventories	(323,136)	409,967	(1,101,735)
Prepaid expenses and other current assets	(519,003)	228,520	(62,859)
Accounts payable	478,189	269,679	(320,632)
Income tax payable	614,218	265,874	(60,034)
Other current liabilities	(120,912)	267,041	325,055
Net cash provided by operating activities	2,645,108	3,117,622	1,684,276
Investing Activities:
Purchase of property, plant and equipment	(1,756,285)	(1,763,869)	(1,171,788)
Business acquisition, net of cash acquired	(15,057,816)
Patents, intangibles and goodwill	346,571	(65,882)	(57,685)
Purchases of marketable securities	(46,363,183)	(66,622,304)	(55,358,876)
Sales and maturities of marketable securities	51,101,714	65,683,722	53,853,269
Net cash used in investing activities	(11,728,999)	(2,768,333)	(2,735,080)
Financing Activities:
Proceeds from short-term debt	17,864,367
Increase in short-term debt		600,000	2,000,000
Payments on long-term debt	(2,643,415)	(1,765,124)	(3,940,120)
Excess tax benefit from exercises of stock options		39,979	562,308
Repurchase of common stock	(2,513,871)	(1,202,339)	(1,058,041)
Proceeds from issuance of common stock	646,917	40,942	1,782,700
Net cash provided by (used in) financing activities	13,353,998	(2,286,542)	(653,153)
Effect of exchange rate on cash and cash equivalents	(93,079)	117,576	(438,459)
Increase (decrease) in cash and cash equivalents	4,177,028	(1,819,677)	(2,142,416)
Cash and cash equivalents at beginning of year	4,545,907	6,365,584	8,508,000
Cash and cash equivalents at end of year	8,722,935	4,545,907	6,365,584
Supplemental Cash Flow Information:
Cash paid for interest	73,907	109,779	443,791
Cash paid for income taxes	$ 85,602	$ 264,743	$ 313,640