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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income (loss) $ (5,625,000) $ 6,823,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 4,075,000 2,832,000
Amortization of marketable securities premium 394,000 220,000
Stock-based compensation 1,004,000 873,000
Provision for doubtful accounts 627,000 0
Gain on sale of cost method investment (811,000) 0
(Gain) Loss on disposal of property, plant and equipment (7,000) 176,000
Changes in assets and liabilities:    
Accounts receivable, net 1,083,000 1,076,000
Inventories 2,147,000 6,071,000
Prepaid expenses and other current assets (1,730,000) 1,923,000
Other assets (77,000) (97,000)
Accounts payable 2,647,000 1,287,000
Accrued liabilities 774,000 (795,000)
Other long-term liabilities (494,000) (824,000)
Net cash provided by operating activities 4,007,000 19,565,000
Cash flows from investing activities:    
Purchases of property, plant and equipment (3,919,000) (4,951,000)
Proceeds from sales of property, plant and equipment 9,000 0
Purchases of available-for-sale securities (14,091,000) (8,225,000)
Proceeds from maturities of available-for-sale securities 12,486,000 6,660,000
Net cash used in investing activities (5,515,000) (6,516,000)
Cash flows from financing activities:    
Proceeds from common stock options exercised 278,000 276,000
Repurchases of the Company's common stock (287,000) 0
Dividends paid by joint ventures (1,730,000) (4,086,000)
Net cash used in financing activities (1,739,000) (3,810,000)
Effect of exchange rate changes on cash and cash equivalents 336,000 108,000
Net increase (decrease) in cash and cash equivalents (2,911,000) 9,347,000
Cash and cash equivalents at the beginning of the period 30,634,000 26,156,000
Cash and cash equivalents at the end of the period $ 27,723,000 $ 35,503,000