XML 44 R31.htm IDEA: XBRL DOCUMENT v3.8.0.1

Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Stockholders' Equity Note [Abstract]

Schedule of assumptions used in estimation of grant date fair value of RSUs

The Company recognizes compensation expenses on these RSUs based on estimated grant date fair value, with the following assumptions:

		2014				2015
Expected dividend yield			2.06	%			3.22	%
Termination rate			4.35	%			0	%

Schedule of assumptions used in estimation of grant date fair value of options

2. The Company recognizes compensation expenses on these options based on estimated grant date fair value using the Binomial option-pricing model with the following assumptions:

Average Risk-free interest rate (a)			2.08	%
Expected dividend yield			2.09	%
Average expected volatility  (b)			53.01	%
Termination rate			9	%
Suboptimal factor(c)			3.4

	(a)	Risk-free interest rate represents risk free US$ zero-coupon US Government Bonds at time of grant.
	(b)	Expected average volatility represents a weighted average standard deviation rate for the price of the Company’s ordinary shares on the NASDAQ National Market.
	(c)	Suboptimal factor represents the multiple of the increase in the market share price on the day of grant of the option which, should it come to pass, will lead to exercise of the option by the employee. It is the average suboptimal factor of the Company and similar companies.

2. The Company recognizes compensation expenses on these options based on estimated grant date fair value using the Binomial option-pricing model with the following assumptions:

Average Risk-free interest rate (a)			1.58	%
Expected dividend yield			2.42	%
Average expected volatility  (b)			47.90	%
Termination rate			9	%
Suboptimal factor(c)			3.32

	(a)	Risk-free interest rate represents risk free US$ zero-coupon US Government Bonds at time of grant.
	(b)	Expected average volatility represents a weighted average standard deviation rate for the price of the Company’s ordinary shares on the NASDAQ National Market.
	(c)	Suboptimal factor represents the multiple of the increase in the market share price on the day of grant of the option which, should it come to pass, will lead to exercise of the option by the employee. It is the average suboptimal factor of the Company and similar companies.

2. The Company recognizes compensation expenses on these options based on estimated grant date fair value using the Binomial option-pricing model with the following assumptions:

Average Risk-free interest rate (a)			2.35	%
Expected dividend yield			2.42	%
Average expected volatility  (b)			43.71	%
Termination rate			9	%
Suboptimal factor (c)			3.28

	(a)	Risk-free interest rate represents risk free US$ zero-coupon US Government Bonds at time of grant.
	(b)	Expected average volatility represents a weighted average standard deviation rate for the price of the Company’s ordinary shares on the NASDAQ National Market.
	(c)	Suboptimal factor represents the multiple of the increase in the market share price on the day of grant of the option which, should it come to pass, will lead to exercise of the option by the employee. It is the average suboptimal factor of the Company and similar companies.

3. The Company recognizes compensation expenses on these RSUs based on estimated grant date fair value, with the following assumptions:

Expected dividend yield			2.68	%
Termination rate			1.74	%

Stock Option Summary

The following table summarizes information regarding stock options as at December 31, 2017:

		Options outstanding								Options exercisable
						Weighted average								Weighted average
						remaining								remaining
Exercise price		Number				contractual life				Number				contractual life
US$		of options				(in years)				of options				(in years)
15.28				7,825				2.7				7,825				2.7
26.91				19,582				5.6				19,582				5.6
33.27				19,706				8.3				13,137				8.3
28.38				88,124				6.4				-				-
39.62				114,674				7.1				-				-
				249,911								40,544

Stock Option Activity

The stock option activity under the abovementioned plans is as follows:

										Weighted
						Weighted				average
		Number				average				grant date
		of options				exercise price				fair value
						US$				US$
Balance at January 1, 2015			192,130
Granted			89,907				26.91				10.04
Exercised			(61,711	)			15.28				6.54
Forfeited			(5,625	)			24.07				9.19
Balance at December 31, 2015			214,701
Granted*			116,455				29.34				10.96
Exercised			(62,269	)			15.28				6.54
Forfeited			(2,882	)			29.71				11.79
Balance at December 31, 2016			266,005
Granted			119,925				39.62				11.89
Exercised			(124,918	)			21.46				8.46
Forfeited			(11,101	)			33.18				10.87
Balance at December 31, 2017			249,911
Exercisable at December 31, 2017			40,544

* In 2016 the Company granted in the aggregate, 116,455 options. Regarding the grant of 93,660 options, see Note 11E. Regarding the grant of 22,795 options, see Note 3B.

Schedule of Restricted Share Units activity

The Restricted Share Units activity under the abovementioned plans is as follows:

						Weighted
		Number of				average
		Restricted				grant date
		Share Units				fair value
		US$				US$
Balance at January 1, 2015			74,000
Granted			8,000				29.09
Vested			(4,000	)			46.07
Balance at  December 31, 2015			78,000
Vested			(35,000	)			46.54
Balance at  December 31, 2016			43,000
Granted			78,000				34.90
Vested			(43,000	)			42.52
Balance at December 31, 2017			78,000

Summary of Allocation of the Stock-Based Compensation Expenses

During 2015, 2016 and 2017, the Company recorded share-based compensation expenses. The following summarizes the allocation of the stock-based compensation expenses:

		Year ended December 31
		2015				2016				2017
		US$ thousands				US$ thousands				US$ thousands
Cost of sales			150				180				320
Research and development costs			455				504				832
Selling and marketing expenses			502				366				537
General and administrative expenses			806				500				736
			1,913				1,550				2,425

X

- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of restricted stock units.

+ References

No definition available.

+ Details

Name:	silc_ScheduleOfShareBasedPaymentAwardRestrictedStockUnitsAwardValuationAssumptionsTableTextBlock
Namespace Prefix:	silc_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

+ Details

Name:	us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration