XML 49 R34.htm IDEA: XBRL DOCUMENT v3.22.1

Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Stockholders' Equity Note [Abstract]

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

	2017	2020
Expected dividend yield	2.68%	0%

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

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.

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.

Average Risk-free interest rate (a)	2.92 %
Expected dividend yield	0.0 %
Average expected volatility (b)	45.13 %
Termination rate	9 %
Suboptimal factor (c)	3.2

(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.

Average Risk-free interest rate (a)	2.55 %
Expected dividend yield	0.0 %
Average expected volatility (b)	44.62 %
Termination rate	9 %
Suboptimal factor (c)	3.18

(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.

Average Risk-free interest rate (a)	0.75 %
Expected dividend yield	0.0 %
Average expected volatility (b)	45.29 %
Termination rate	9 %
Suboptimal factor (c)	3.16

(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.

Average Risk-free interest rate (a)	1.41 %
Expected dividend yield	0.0 %
Average expected volatility (b)	45.28 %
Termination rate	9 %
Suboptimal factor (c)	3.14

(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.

Stock Option Summary

		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)
26.91				18,329				1.6				18,329				1.6
33.27				14,865				4.3				14,865				4.3
28.38				35,533				2.4				35,533				2.4
39.62				76,176				3.1				76,176				3.1
36.11				83,016				4.3				83,016				4.3
33.83				87,334				5.1				87,334				5.1
32.54				134,343				6.4				-				-
41.84				129,925				7.4				-				-
				579,521								315,253

Stock Option Activity

		Number of options				Weighted average exercise price				Weighted average grant date fair value
						US$				US$
Balance at January 1, 2019			365,495
Granted			141,928				33.83				13.35
Exercised			(5,500	)			28.09				10.03
Forfeited			(36,676	)			35.88				13.50
Balance at December 31, 2019			465,247
Granted			148,426				32.54				14.82
Exercised			(12,357	)			22.38				8.63
Forfeited			(11,269	)			33.93				14.56
Balance at December 31, 2020			590,047
Granted			133,925				41.84				16.62
Exercised			(132,702	)			34.01				12.85
Forfeited			(11,749	)			35.79				15.39
Balance at December 31, 2021			579,521
Exercisable at December 31, 2021			315,253

Schedule of Restricted Share Units activity

		Number of Restricted Share Units				Weighted average grant date fair value
						US$
Balance at January 1, 2019			78,000
Vested			(39,000	)			35.36
Balance at December 31, 2019			39,000
Granted			86,000				35.33
Vested			(39,000	)			34.43
Balance at December 31, 2020 and December 31, 2021			86,000

Summary of Allocation of the Stock-Based Compensation Expenses

		Year ended December 31
		2019				2020				2021
		US$ thousands
Cost of sales			437				535				480
Research and development costs			900				959				1,011
Selling and marketing expenses			493				602				697
General and administrative expenses			525				615				674
			2,355				2,711				2,862

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:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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=122041274&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

+ Details

Name:	us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types: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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types: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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types: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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types: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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types: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