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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 $ 17,077 $ 9,871 $ 8,243
Adjustments required to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 659 454 379
Write-down of obsolete inventory 1,926 873 768
Liability for employees' severance benefits, net 174 23 (42)
Discount of marketable securities 729 579 462
Share-based compensation expense 668 544 437
Deferred taxes (552) 22 86
Capital (gain) loss 1    (6)
Changes in assets and liabilities:      
Accounts receivable - trade (2,322) (3,741) (1,780)
Accounts receivable - other (114) (537) (717)
Accounts receivable - Related parties (139) (37) (71)
Inventories (15,909) (4,495) (3,801)
Trade accounts payable (1,474) 3,828 250
Other accounts payable and accrued expenses 1,220 1,436 508
Accounts payable - Related parties (26) 69 (25)
Net cash provided by operating activities 1,918 8,889 4,691
Cash flows from investing activities      
Proceeds from (investments in) short term bank deposits, net (473) 2,483 4,199
Purchases of property, plant and equipment (822) (798) (486)
Investment in intangible assets (100)      
Proceeds from maturity of marketable securities 12,500 8,955 9,531
Purchases of marketable securities (11,384) (17,992) (13,071)
Net cash provided by (used in) investing activities (279) (7,352) 173
Cash flows from financing activities      
Exercise of options 1,893 277 164
Dividend (3,913)      
Net cash provided by (used in) financing activities (2,020) 277 164
Effect of exchange rate changes on cash balances held 72 9 (202)
Increase (decrease) in cash and cash equivalents (309) 1,823 4,826
Cash and cash equivalents at beginning of year 13,306 11,483 6,657
Cash and cash equivalents at end of year 12,997 13,306 11,483
Supplementary cash flow information Non-cash transactions:      
Investments in PPE and Intangible assets 207 9 80
Supplementary cash flow information Cash paid during the year for:      
Income taxes $ 2,154 $ 635 $ 623