CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Cash flows from operating activities:
Net loss	$ (899)		$ (1,835)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,403		1,404
Amortization of marketable securities premium	55		122
Stock-based compensation	274		292
Loss (gain) on disposal of property, plant and equipment	9		(5)
Provision for doubtful accounts	150		1
Realized gain on sale of investments	(367)		0
Changes in assets and liabilities:
Accounts receivable, net	(1,052)		(1,459)
Inventories	(858)		985
Prepaid expenses and other current assets	1,124		1,584
Other assets	(151)		18
Accounts payable	1,979		(489)
Accrued liabilities	(1,906)	[1]	(697)	[1]
Other long-term liabilities	(110)		(308)
Net cash used in operating activities	(349)		(387)
Cash flows from investing activities:
Purchases of property, plant and equipment	(676)		(163)
Proceeds from sales of property, plant and equipment	2		5
Purchases of available for sale securities	(4,304)		(3,725)
Proceeds from sales and maturities of available-for-sale securities	10,277		2,180
Net cash provided by (used in) investing activities	5,299		(1,703)
Cash flows from financing activities:
Proceeds from common stock options exercised	76		0
Repurchase of the Company's common stock, including commission	(617)		0
Net cash used in financing activities	(541)		0
Effect of exchange rate changes on cash and cash equivalents	62		(111)
Net increase (decrease) in cash and cash equivalents	4,471		(2,201)
Cash and cash equivalents at the beginning of the period	28,814		24,961
Cash and cash equivalents at the end of the period	$ 33,285		$ 22,760

[1] Dividends accrued but not paid by joint ventures of $646 and $729 was included in accrued liabilities as of March 31, 2015 and March 31, 2014, respectively.