CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating activities:
Net income	$ 3,340,940	$ 1,023,091
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	1,299,332	1,234,412
Amortization	758,027	761,100
Stock based compensation	590,372	775,588
Excess tax benefit from exercises of stock options	(686,530)
Deferred income tax expense	273,212	22,248
Changes in operating assets and liabilities:
Accounts receivable, net	447,614	(291,103)
Inventories	412,628	796,602
Prepaid expenses and other current assets	(35,427)	(185,323)
Accounts payable	283,349	(324,936)
Income tax payable	910,821	(210,901)
Other current liabilities	(272,733)	(136,596)
Net cash provided by operating activities	7,321,605	3,464,182
Investing activities:
Purchase of property, plant and equipment	(2,871,042)	(1,148,791)
Purchase of patents	(31,655)	(268,041)
Purchases of marketable securities	(16,399,911)	(18,994,217)
Sales and maturities of marketable securities	16,279,746	38,657,174
Net cash provided by (used in) investing activities	(3,022,862)	18,246,125
Financing activities:
Proceeds from long-term debt		778,623
Payments on long-term debt		(18,640,808)
Repurchase of common stock		(1,088,619)
Excess tax benefit from exercises of stock options	686,530
Proceeds from issuance of common stock	807,990	180,291
Net cash provided by (used in) financing activities	1,494,520	(18,770,513)
Effect of exchange rate on cash and cash equivalents	(380,637)	(73,461)
Increase in cash and cash equivalents	5,412,626	2,866,333
Cash and cash equivalents at beginning of period	13,921,363	8,722,935
Cash and cash equivalents at end of period	19,333,989	11,589,268
Supplemental Cash Flow Information
Cash paid for interest		164,178
Income taxes paid	$ 396,472	$ 863,865