Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net income	$ 14,605us-gaap_NetIncomeLoss	$ 17,077us-gaap_NetIncomeLoss	$ 9,871us-gaap_NetIncomeLoss
Adjustments required to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	996	659	454
Write-down of obsolete inventory	1,029us-gaap_InventoryWriteDown	1,926us-gaap_InventoryWriteDown	873us-gaap_InventoryWriteDown
Liability for employees' severance benefits, net	(86)	174	23
Discount of marketable securities	758	729	579
Share-based compensation expense	1,266us-gaap_ShareBasedCompensation	668us-gaap_ShareBasedCompensation	544us-gaap_ShareBasedCompensation
Deferred taxes	(219)us-gaap_DeferredIncomeTaxExpenseBenefit	(552)us-gaap_DeferredIncomeTaxExpenseBenefit	22us-gaap_DeferredIncomeTaxExpenseBenefit
Capital (gain) loss		1
Changes in assets and liabilities:
Accounts receivable - trade	(3,248)	(2,322)	(3,741)
Accounts receivable - other	188	(114)	(537)
Accounts receivable - Related parties	(6)	(139)	(37)
Inventories	3,416us-gaap_IncreaseDecreaseInInventories	(15,909)us-gaap_IncreaseDecreaseInInventories	(4,495)us-gaap_IncreaseDecreaseInInventories
Trade accounts payable	1,321	(1,474)	3,828
Other accounts payable and accrued expenses	649	1,220	1,436
Contingent consideration	45
Accounts payable - Related parties	(30)	(26)	69
Net cash provided by operating activities	20,684	1,918	8,889
Cash flows from investing activities
Proceeds from (investments in) short term bank deposits, net	(1,000)	(473)	2,483
Purchases of property, plant and equipment	(1,858)	(822)	(798)
Investment in intangible assets	(100)	(100)
Proceeds from maturity of marketable securities	14,750	12,500	8,955
Purchases of marketable securities	(11,740)	(11,384)	(17,992)
Acquisition of subsidiary, net of acquired cash (see Note 3)	(10,048)
Net cash used in investing activities	(9,996)	(279)	(7,352)
Cash flows from financing activities
Exercise of options	1,353	1,893	277
Dividend	(7,183)us-gaap_PaymentsOfDividends	(3,913)us-gaap_PaymentsOfDividends
Net cash provided by (used in) financing activities	(5,830)	(2,020)	277
Effect of exchange rate changes on cash balances held	35	72	9
Increase (decrease) in cash and cash equivalents	4,893	(309)	1,823
Cash and cash equivalents at beginning of year	12,997	13,306	11,483
Cash and cash equivalents at end of year	17,890	12,997	13,306
Supplementary cash flow information Non-cash transactions:
Investments in PPE and Intangible assets	87us-gaap_FairValueOfAssetsAcquired	207us-gaap_FairValueOfAssetsAcquired	9us-gaap_FairValueOfAssetsAcquired
Supplementary cash flow information Cash paid during the year for:
Income taxes	$ 1,277us-gaap_IncomeTaxesPaid	$ 2,154us-gaap_IncomeTaxesPaid	$ 635us-gaap_IncomeTaxesPaid

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- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

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- Definition

Amount of cash outflow through purchase of long-term held-to-maturity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Publisher FASB

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-Topic 230

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-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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- Definition

The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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- Definition

The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

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-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

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-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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