Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Operating activities:
Net income	$ 1,230	$ 724
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, equipment and improvements	848	784
Amortization of identifiable intangible assets	1,071	1,245
Stock-based compensation	955	931
Excess tax benefits from stock-based compensation	(28)	(13)
Deferred income tax benefit	(542)	(583)
Bad debt/product return provision	221	323
Inventory obsolescence	250	476
Restructuring	0	236
Other	38	(274)
Changes in operating assets and liabilities (net of acquisition)	(1,755)	(3,607)
Net cash provided by operating activities	2,288	242
Investing activities:
Purchase of marketable securities	(9,873)	(22,789)
Proceeds from maturities of marketable securities	17,473	12,298
Proceeds from sale of investment	0	135
Acquisition of business, net of cash acquired	12,919	0
Purchase of property, equipment, improvements and certain other intangible assets	(1,427)	(1,624)
Net cash used in investing activities	(6,746)	(11,980)
Financing activities:
Excess tax benefits from stock-based compensation	28	13
Proceeds from stock option plan transactions	169	150
Proceeds from employee stock purchase plan transactions	248	314
Purchase of treasury stock	(4,226)	0
Net cash (used in) provided by financing activities	(3,781)	477
Effect of exchange rate changes on cash and cash equivalents	3	(855)
Net decrease in cash and cash equivalents	(8,236)	(12,116)
Cash and cash equivalents, beginning of period	60,246	54,684
Cash and cash equivalents, end of period	52,010	42,568
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Issuance of common stock for business acquisition	$ (6,804)	$ 0