CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net loss	$ (404)	$ (5,625)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	4,219	4,075
Amortization of marketable securities premium	352	394
Stock-based compensation	861	1,004
Provision for doubtful accounts	9	627
Gain on sale of investments	(626)	(811)
Gain on disposal of property, plant and equipment, net	(10)	(7)
Changes in assets and liabilities:
Accounts receivable, net	(6,182)	1,083
Inventories	2,400	2,147
Prepaid expenses and other current assets	2,076	(1,730)
Other assets	(655)	(77)
Accounts payable	1,372	2,647
Accrued liabilities	(187)	774
Other long-term liabilities	(648)	(494)
Net cash provided by operating activities	2,577	4,007
Cash flows from investing activities:
Purchases of property, plant and equipment	(1,374)	(3,919)
Proceeds from sales of property, plant and equipment	10	9
Purchases of available for sale securities	(11,346)	(14,091)
Proceeds from maturities of available for sale securities	10,998	12,486
Net cash used in investing activities	(1,712)	(5,515)
Cash flows from financing activities:
Proceeds from common stock options exercised	134	278
Repurchase of the Company's common stock, including commission	0	(287)
Dividends paid by joint ventures	(83)	(1,730)
Net cash provided by (used in) financing activities	51	(1,739)
Effect of exchange rate changes on cash and cash equivalents	(84)	336
Net increase (decrease) in cash and cash equivalents	832	(2,911)
Cash and cash equivalents at the beginning of the period	24,961	30,634
Cash and cash equivalents at the end of the period	$ 25,793	$ 27,723