Annual report pursuant to Section 13 and 15(d)

Information Concerning Industry Segments and Major Customers (Narrative) (Details)

v3.21.1
Information Concerning Industry Segments and Major Customers (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
segment
customer
Dec. 31, 2019
USD ($)
customer
Segment Reporting Information [Line Items]    
Number of segments | segment 2  
Sales [Member] | Electronics & Software Segment [Member]    
Segment Reporting Information [Line Items]    
Number of customers 2 2
Sales [Member] | Services & Support Segment [Member]    
Segment Reporting Information [Line Items]    
Concentration risk percentage 10.30%  
Number of customers 1  
Accounts Receivable [Member] | Electronics & Software Segment [Member]    
Segment Reporting Information [Line Items]    
Concentration risk percentage 17.00%  
Number of customers 1 2
Accounts Receivable [Member] | Services & Support Segment [Member]    
Segment Reporting Information [Line Items]    
Concentration risk percentage   38.00%
Number of customers   1
Foreign Countries [Member] | Services & Support Segment [Member]    
Segment Reporting Information [Line Items]    
Long-lived assets | $ $ 49 $ 112
United States [Member] | Sales [Member]    
Segment Reporting Information [Line Items]    
Concentration risk percentage 87.00% 74.00%
Customer 1 [Member] | Sales [Member] | Electronics & Software Segment [Member]    
Segment Reporting Information [Line Items]    
Concentration risk percentage 18.70% 21.20%
Customer 1 [Member] | Accounts Receivable [Member] | Electronics & Software Segment [Member]    
Segment Reporting Information [Line Items]    
Concentration risk percentage   45.00%
Customer 2 [Member] | Sales [Member] | Electronics & Software Segment [Member]    
Segment Reporting Information [Line Items]    
Concentration risk percentage 17.30% 16.20%
Customer 2 [Member] | Accounts Receivable [Member] | Electronics & Software Segment [Member]    
Segment Reporting Information [Line Items]    
Concentration risk percentage   17.00%