Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income during the period	$ 3,070	$ 3,438
Adjustments to reconcile net income to net cash provided by (used in) operations:
Depreciation and amortization expense	1,255	979
Amortization of deferred rent	(69)	(77)
Stock-based compensation expense	266	205
Provision for doubtful accounts, net	40	61
Inventory valuation reserve adjustments	537	524
Tax benefit from the exercise of stock options	(92)	(76)
Changes in operating assets and liabilities:
Receivables	(65)	(115)
Inventories	(1,136)	(1,258)
Deferred income taxes	(333)	0
Prepaid expenses and other assets	(396)	(262)
Accounts payable	(298)	1,180
Accrued liabilities	828	143
Income taxes payable	1,445	(14,782)
Deferred product revenue	822	512
Other long-term liabilities	(62)	0
Net cash provided by (used in) operating activities	5,812	(9,528)
Cash flows from investing activities:
Payment towards business acquisitions	(13,068)	0
Purchase of property and equipment	(496)	(723)
Purchase of patents	(90)	0
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities	6,790	0
Purchase of marketable securities	(6,655)	(25,409)
Net cash used in investing activities	(13,519)	(26,132)
Cash flows from financing activities:
Proceeds from the exercise of stock options	1,297	456
Tax benefit from stock options	92	76
Stock registration costs	(55)	0
Treasury stock purchased	(1,927)	(2,191)
Net cash used in financing activities	(593)	(1,659)
Net decrease in cash and cash equivalents	(8,300)	(37,319)
Cash and cash equivalents at the beginning of the period	17,192	55,509
Cash and cash equivalents at the end of the period	8,892	18,190
Supplemental disclosure of cash flow information:
Cash paid for income taxes	1,695	16,987
Noncash or Part Noncash Acquisition, Fixed Assets Acquired	0	150
Issuance of common stock in connection with acquisition of business	$ 1,679	$ 0