Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (6,711)	$ 4,357
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	1,843	1,955
Provision for doubtful accounts	(165)	(62)
Deferred taxes	4,808	629
Foreign currency transaction gains	(12)	(68)
Excess tax benefits from equity compensation plans		(3)
Realized gains on available-for-sale securities	(8)
Unrealized loss on available-for-sale equity security	42
Stock compensation costs	449	430
Changes in operating assets and liabilities:
Accounts receivable	5,945	(549)
Inventories	(1,801)	2,859
Income tax refunds receivable	(1,129)	184
Other assets	154	65
Accounts payable	(1,696)	(1,095)
Advance customer payments	(299)	(144)
Accrued expenses	(1,412)	638
Net cash provided by operating activities	8	9,196
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities of available-for-sale marketable securities	13,241	10,053
Proceeds from sales of available-for-sale marketable securities	3,154	3,175
Purchases of available-for-sale marketable securities	(21,630)	(16,304)
Additions to equipment and leasehold improvements	(1,350)	(772)
Additions to patents	(113)	(104)
Net cash used in investing activities	(6,698)	(3,952)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	27	1
Excess tax benefits from equity compensation plans		3
Proceeds from issuance of common stock under employee stock purchase plan	139	201
Common stock repurchases	(21)
Net cash provided by financing activities	145	205
Effects of exchange rate changes on cash and cash equivalents	94	(85)
Net increase (decrease) in cash and cash equivalents	(6,451)	5,364
Cash and cash equivalents - beginning of period	13,791	8,427
Cash and cash equivalents - end of period	$ 7,340	$ 13,791