Information Concerning Industry Segments and Major Customers (Narrative) (Details)	12 Months Ended
Dec. 31, 2021 segment customer	Dec. 31, 2020 customer
Segment Reporting Information [Line Items]
Number of segments \| segment	2
United States [Member] \| Sales [Member] \| Segment Concentration Risk [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	98.00%	99.00%
One Customer [Member] \| Sales [Member] \| Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage		54.00%
Number of customers		1
One Customer [Member] \| Accounts Receivable [Member] \| Electronics & Software Segment [Member] \| Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage		87.00%
One Customer [Member] \| Accounts Receivable [Member] \| Services & Support Segment [Member] \| Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	53.00%
Number of customers	1	1

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration