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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income $ 6,150 $ 25,823 $ 20,376
Adjustments to reconcile net income (loss) to net cash provided by operations:      
Depreciation and amortization 3,927 3,410 2,916
Amortization of marketable securities premium/discount 323 368 316
Stock-based compensation 1,215 896 655
Realized loss (gain) on sale of investments 0 8 (346)
Loss on disposal of property, plant and equipment 195 6 5
Changes in assets and liabilities:      
Accounts receivable, net 54 5,165 (7,726)
Inventories 5,659 (9,839) (8,288)
Prepaid expenses and other current assets 1,784 (3,313) (1,684)
Other assets (174) 426 (5,689)
Accounts payable 2,608 (3,840) 1,530
Accrued liabilities 461 (197) 3,187
Other long-term liabilities (900) (781) 5,757
Net cash provided by operating activities 21,302 18,132 11,009
Cash flows from investing activities:      
Purchases of property, plant and equipment (7,079) (13,102) (6,386)
Proceeds from disposal of property, plant and equipment 2 33 10
Purchases of available for sale securities (12,116) (13,951) (18,982)
Proceeds from sales and maturities of available for sale securities 6,900 16,179 20,086
Investments in joint ventures 0 (3,024) 0
Loans to related parties (875) (1,565) 0
Net cash used in investing activities (13,168) (15,430) (5,272)
Cash flows from financing activities:      
Proceeds from common stock options exercised 294 637 1,497
Dividends paid by joint ventures (4,086) (1,636) (527)
Long-term debt payments 0 0 (496)
Net cash provided by (used in) financing activities (3,792) (999) 474
Effect of exchange rate changes on cash and cash equivalents 136 729 579
Net increase in cash and cash equivalents 4,478 2,432 6,790
Cash and cash equivalents at the beginning of the year 26,156 23,724 16,934
Cash and cash equivalents at the end of the year 30,634 26,156 23,724
Supplemental disclosures:      
Interest paid 0 0 14
Income taxes paid $ 1,729 $ 3,234 $ 1,979