Condensed Consolidated Statements Of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (4,120,000)	$ (212,000)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	1,292,000	1,368,000
Provision for doubtful accounts	(22,000)	(95,000)
Deferred taxes	43,000
Foreign currency transaction (gains) losses	151,000	(19,000)
Realized (gains) losses on available-for-sale securities	21,000	(6,000)
Stock compensation costs	330,000	349,000
Changes in operating assets and liabilities:
Accounts receivable	(1,397,000)	2,943,000
Inventories	(399,000)	(1,435,000)
Income tax refunds receivable	536,000	(185,000)
Other assets	(271,000)	(79,000)
Accounts payable	1,671,000	95,000
Advance customer payments	(229,000)	(224,000)
Accrued expenses	(339,000)	(810,000)
Net cash provided by (used in) operating activities	(2,733,000)	1,690,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities of available-for-sale marketable securities	6,294,000	10,584,000
Proceeds from sales of available-for-sale marketable securities	4,340,000	2,936,000
Purchases of available-for-sale marketable securities	(7,996,000)	(18,681,000)
Additions to equipment and leasehold improvements	(610,000)	(1,086,000)
Additions to patents	(39,000)	(95,000)
Net cash provided by (used in) investing activities	1,989,000	(6,342,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	25,000
Common stock repurchases	(2,014,000)
Proceeds from issuance of common stock under employee stock purchase plan	64,000	139,000
Net cash provided by (used in) financing activities	(1,925,000)	139,000
Effects of exchange rate changes on cash and cash equivalents	(147,000)	104,000
Net decrease in cash and cash equivalents	(2,816,000)	(4,409,000)
Cash and cash equivalents - beginning of period	7,340,000	13,791,000
Cash and cash equivalents - end of period	$ 4,524,000	$ 9,382,000