CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Operating Activities:
Net income (loss)	$ 2,050,484	$ (1,315,304)	$ (253,535)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	1,643,014	1,538,102	1,407,963
Amortization	1,006,847	978,953	694,925
Stock based compensation	983,286	1,495,773	1,481,102
Deferred income taxes	650,209	(834,412)	(172,627)
Gain on disposal of property and equipment	(40,037)
Loss on sale of investment	128,997
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable, net	(2,260,106)	652,640	(1,481,287)
Inventories	1,426,371	(323,136)	409,967
Prepaid expenses and other current assets	(52,498)	(519,003)	228,520
Accounts payable	278,123	478,189	269,679
Income tax payable	(241,044)	614,218	265,874
Other current liabilities	362,594	(120,912)	267,041
Net cash provided by operating activities	5,936,240	2,645,108	3,117,622
Investing Activities:
Purchase of property, plant and equipment	(1,519,437)	(1,756,285)	(1,763,869)
Proceeds from sale of property and equipment	79,227
Business acquisition, net of cash acquired		(15,057,816)
Patents, intangibles and goodwill	(265,423)	346,571	(65,882)
Purchases of marketable securities	(25,245,286)	(46,363,183)	(66,622,304)
Sales and maturities of marketable securities	44,899,761	51,101,714	65,683,722
Net cash provided by (used in) investing activities	17,948,842	(11,728,999)	(2,768,333)
Financing Activities:
Proceeds from short-term debt	778,623	17,864,367
Increase in short-term debt			600,000
Payments on long-term debt	(18,640,808)	(2,643,415)	(1,765,124)
Excess tax benefit from exercises of stock options			39,979
Repurchase of common stock	(1,088,619)	(2,513,871)	(1,202,339)
Proceeds from issuance of common stock	180,291	646,917	40,942
Net cash provided by (used in) financing activities	(18,770,513)	13,353,998	(2,286,542)
Effect of exchange rate on cash and cash equivalents	83,859	(93,079)	117,576
Increase (decrease) in cash and cash equivalents	5,198,428	4,177,028	(1,819,677)
Cash and cash equivalents at beginning of year	8,722,935	4,545,907	6,365,584
Cash and cash equivalents at end of year	13,921,363	8,722,935	4,545,907
Supplemental Cash Flow Information:
Cash paid for interest	164,178	73,907	109,779
Cash paid for income taxes	$ 863,865	$ 85,602	$ 264,743