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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income (loss) $ (6,813) $ 6,150 $ 25,823
Adjustments to reconcile net income (loss) to net cash provided by operations:      
Depreciation and amortization 5,470 3,927 3,410
Amortization of marketable securities premium 518 323 368
Stock-based compensation 1,277 1,215 896
Provision for doubtful accounts 869 0 0
Realized loss (gain) on sale of investments 0 0 8
Gain on sale of cost method investment (811) 0 0
Loss (gain) on disposal of property, plant and equipment (9) 195 6
Changes in assets and liabilities:      
Accounts receivable, net 2,160 54 5,165
Inventories 1,439 5,659 (9,839)
Prepaid expenses and other current assets (645) 1,784 (3,313)
Other assets (1,859) (174) 426
Accounts payable 2,185 2,608 (3,840)
Accrued liabilities (899) 461 (197)
Other long-term liabilities (373) (900) (781)
Net cash provided by operating activities 2,509 21,302 18,132
Cash flows from investing activities:      
Purchases of property, plant and equipment (5,424) (7,079) (13,102)
Proceeds from disposal of property, plant and equipment 0 2 33
Purchases of available for sale securities (14,092) (12,116) (13,951)
Proceeds from sales and maturities of available for sale securities 12,486 6,900 16,179
Investments in joint ventures 0 0 (3,024)
Repayment from (Loans to) related parties 818 (875) (1,565)
Net cash used in investing activities (6,212) (13,168) (15,430)
Cash flows from financing activities:      
Proceeds from common stock options exercised 532 294 637
Repurchases of the Company's common stock, including commission (716) 0 0
Dividends paid by joint ventures (2,329) (4,086) (1,636)
Net cash provided by (used in) financing activities (2,513) (3,792) (999)
Effect of exchange rate changes on cash and cash equivalents 543 136 729
Net increase (decrease) in cash and cash equivalents (5,673) 4,478 2,432
Cash and cash equivalents at the beginning of the year 30,634 26,156 23,724
Cash and cash equivalents at the end of the year 24,961 30,634 26,156
Supplemental disclosures:      
Income taxes paid $ 782 $ 1,729 $ 3,234