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Acquisitions (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended
Dec. 10, 2014
Apr. 18, 2016
Oct. 28, 2015
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2016
Business Acquisition [Line Items]            
Purchase price allocated to goodwill       $ 25,561 $ 25,561  
Silicom Denmark [Member]            
Business Acquisition [Line Items]            
Aggregate purchase price in cash $ 10,161          
Contingent consideration $ 4,683          
Total obligation the company paid           $ 1,463
Percentage of contingent consideration paid in cash           90.00%
Percentage of contingent consideration paid in options to ordinary shares           10.00%
Aggregate options granted   22,795        
ADI Engineering, Inc. [Member]            
Business Acquisition [Line Items]            
Aggregate purchase price in cash     $ 10,000      
Contingent consideration     7,802      
Total purchase price     17,802      
Purchase price allocated to tangible assets     222      
Purchase price allocated to intangibles assets     4,261      
Purchase price allocated to goodwill     $ 13,319      
Term of options     three yearly payments      
Period of recognized goodwill deducted for income tax purposes     10 years