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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 $ 9,871 $ 8,243 $ 5,715
Adjustments required to reconcile net income to net cash provided by operating activities:      
Depreciation 454 379 416
Write-down of obsolete inventory 873 768 780
Liability for employees' severance benefits, net 23 (42) 58
Discount of marketable securities 579 462 467
Share-based compensation expense 544 437 231
Deferred taxes 22 86 156
Capital (gain) loss   (6) 2
Changes in assets and liabilities:      
Accounts receivable - trade (3,741) (1,780) (1,573)
Accounts receivable - other (537) (717) (184)
Accounts receivable - Related parties (37) (71) (17)
Inventories (4,495) (3,801) (4,243)
Trade accounts payable 3,828 250 1,467
Other accounts payable and accrued expenses 1,436 508 51
Accounts payable - Related parties 69 (25) 25
Net cash provided by operating activities 8,889 4,691 3,351
Cash flows from investing activities      
Proceeds from (investments in) short term bank deposits, net 2,483 4,199 (1,956)
Purchases of property, plant and equipment (798) (486) (466)
Proceeds from maturity of marketable securities 8,955 9,531 11,303
Purchases of marketable securities (17,992) (13,071) (12,972)
Net cash provided by (used in) investing activities (7,352) 173 (4,091)
Cash flows from financing activities      
Exercise of options 277 164 259
Net cash provided by financing activities 277 164 259
Effect of exchange rate changes on cash balances held 9 (202) (115)
Increase (decrease) in cash and cash equivalents 1,823 4,826 (596)
Cash and cash equivalents at beginning of year 11,483 6,657 7,253
Cash and cash equivalents at end of year 13,306 11,483 6,657
Supplementary cash flow information Non-cash transactions:      
Investments in fixed assets 9 80  
Supplementary cash flow information Cash paid during the year for:      
Income taxes $ 635 $ 623 $ 1,148