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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net income $ 5,379,000 $ 14,355,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,841,000 1,663,000
Amortization of marketable securities premium 142,000 187,000
Loss on disposal of property, plant and equipment 176,000 5,000
Stock-based compensation 573,000 422,000
Realized loss (gain) on sale of investments 0 8,000
Changes in assets and liabilities:    
Accounts receivable, net (4,391,000) 156,000
Inventories 5,172,000 (3,567,000)
Prepaid expenses and other current assets 1,373,000 (4,547,000)
Other assets 182,000 309,000
Accounts payable 2,564,000 (3,369,000)
Accrued liabilities 267,000 [1] (99,000)
Other long-term liabilities (641,000) (613,000)
Net cash provided by operating activities 12,637,000 4,910,000
Cash flows from investing activities:    
Purchases of property, plant and equipment (2,978,000) (5,977,000)
Purchases of available for sale securities (4,518,000) (11,831,000)
Proceeds from available for sale securities 3,180,000 13,663,000
Investments in joint ventures 0 (2,649,000)
Net cash used in investing activities (4,316,000) (6,794,000)
Cash flows from financing activities:    
Proceeds from common stock options exercised 219,000 533,000
Dividends paid by joint ventures (3,551,000) [1] (1,636,000)
Net cash used in financing activities (3,332,000) (1,103,000)
Effect of exchange rate changes on cash and cash equivalents 136,000 341,000
Net increase (decrease) in cash and cash equivalents 5,125,000 (2,646,000)
Cash and cash equivalents at the beginning of the period 26,156,000 [2] 23,724,000
Cash and cash equivalents at the end of the period $ 31,281,000 $ 21,078,000
[1] Dividend accrued but not paid by joint ventures of $488 was included in accrued liabilities as of June 30, 2012.
[2] The Condensed Consolidated Balance Sheet at December 31, 2011 has been derived from the audited consolidated financial statements at that date.