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Information Concerning Industry Segments And Major Customers (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Segment Reporting Information [Line Items] | |||
| Number of segments | 3us-gaap_NumberOfOperatingSegments | ||
| Sales [Member] | JDL Technologies [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Concentration risk percentage |
17.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementBusinessSegmentsAxis = jcs_JdlTechnologiesMember |
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| Sales [Member] | Suttle [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Concentration risk percentage |
33.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementBusinessSegmentsAxis = jcs_SuttleMember |
18.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementBusinessSegmentsAxis = jcs_SuttleMember |
16.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementBusinessSegmentsAxis = jcs_SuttleMember |
| Sales [Member] | Transition Networks [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Concentration risk percentage |
10.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementBusinessSegmentsAxis = jcs_TransitionNetworksMember |
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| Foreign Countries [Member] | Suttle [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Long-lived assets |
2,810us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = jcs_SuttleMember / us-gaap_StatementGeographicalAxis = jcs_ForeignCountriesMember |
1,225us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = jcs_SuttleMember / us-gaap_StatementGeographicalAxis = jcs_ForeignCountriesMember |
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| United States [Member] | Sales [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Concentration risk percentage |
86.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_US |
87.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_US |
83.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_US |
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- Definition
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/presentationRef
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- Definition
Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. No definition available.
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