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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 - OPERATING ACTIVITIES      
Net income for the year $ 11,828 $ 28,118 $ 22,175
Adjustments to reconcile net income to net cash from (used in) operations:      
Depreciation and amortization 2,783 1,700 1,260
Loss related to equipment and inventory damage 509      
Amortization of deferred stock-based compensation 1,927 1,435 710
Deferred (increase) in deferred income tax assets, net 694 (2,500)   
Increase (decrease) in liability for employee termination benefits, net (27) 43 108
Increase in trade accounts receivables (3,960) (240) (1,617)
Increase in inventories (10,513) (1,056) (7,526)
Decrease (increase) in other current and long term assets (467) (305) 197
Increase (decrease) in trade accounts payables and other long term liabilities 2,510 (1,639) 6,242
Increase in other current liabilities 283 159 2,740
Increase (decrease) in short and long term deferred income 2,151 (614) 1,543
Net cash provided by operating activities 7,718 25,101 25,832
CASH FLOWS - INVESTING ACTIVITIES      
Increase in short-term interest-bearing bank deposits (8,792) (30,685) (26,955)
Decrease (increase) in long-term interest-bearing bank deposits 140 86 (70)
Proceeds from (investments in) short-term held to maturity securities 1,582 (1,582)   
Purchase of fixed assets (3,660) (2,307) (1,565)
Net cash used in investing activities (10,730) (34,488) (28,590)
CASH FLOWS - FINANCING ACTIVITIES      
Shares issued in a public offering       16,968
Shares issued under employee share-based plans 259 2,709 1,323
Net cash provided by financing activities 259 2,709 18,291
Increase (decrease) in cash and cash equivalents (2,753) (6,678) 15,533
Cash and cash equivalents - beginning of year 18,716 25,394 9,861
Cash and cash equivalents - end of year 15,963 18,716 25,394
SCHEDULE A -NON CASH ACTIVITIES      
Transfer of assets from inventory to fixed assets, net of transfer from fixed assets to inventory $ 1,802 $ 2,297 $ 626