|
Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $)
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Dec. 31, 2014
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Dec. 31, 2013
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Cash equivalents |
$ 1,073,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
|
$ 5,992,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
|
| Current Liabilities, fair value |
|
(559,000)us-gaap_AccruedLiabilitiesFairValueDisclosure
|
| Assets (Liabilities) Net, fair value |
17,216,000us-gaap_FairValueNetAssetLiability
|
15,096,000us-gaap_FairValueNetAssetLiability
|
| Level 1 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Cash equivalents |
1,073,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
|
5,752,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
|
| Assets (Liabilities) Net, fair value |
1,073,000us-gaap_FairValueNetAssetLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
|
5,752,000us-gaap_FairValueNetAssetLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
|
| Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Cash equivalents |
|
240,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|
| Assets (Liabilities) Net, fair value |
16,143,000us-gaap_FairValueNetAssetLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|
9,903,000us-gaap_FairValueNetAssetLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|
| Level 3 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Current Liabilities, fair value |
|
(559,000)us-gaap_AccruedLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
|
| Assets (Liabilities) Net, fair value |
|
(559,000)us-gaap_FairValueNetAssetLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
|
| Money Market Funds [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Cash equivalents |
1,073,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_MoneyMarketFundsMember
|
5,752,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_MoneyMarketFundsMember
|
| Money Market Funds [Member] | Level 1 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Cash equivalents |
1,073,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
|
5,752,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
|
| Certificates Of Deposit [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Cash equivalents |
|
240,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CertificatesOfDepositMember
|
| Certificates Of Deposit [Member] | Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Cash equivalents |
|
240,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|
| Accrued Consideration [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Current Liabilities, fair value |
|
(559,000)us-gaap_AccruedLiabilitiesFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= jcs_AccruedConsiderationMember
|
| Accrued Consideration [Member] | Level 3 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Current Liabilities, fair value |
|
(558,801)us-gaap_AccruedLiabilitiesFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= jcs_AccruedConsiderationMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
|
| Short-Term Investments [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Investments |
4,603,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= us-gaap_ShortTermInvestmentsMember
|
5,742,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= us-gaap_ShortTermInvestmentsMember
|
| Short-Term Investments [Member] | Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Investments |
4,603,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|
5,742,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|
| Short-Term Investments [Member] | Certificates Of Deposit [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Investments |
1,920,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CertificatesOfDepositMember
|
2,583,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CertificatesOfDepositMember
|
| Short-Term Investments [Member] | Certificates Of Deposit [Member] | Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Investments |
1,920,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|
2,583,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|
| Short-Term Investments [Member] | Corporate Notes/Bonds [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Investments |
2,683,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= jcs_CorporateNotesAndBondsMember
|
3,159,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= jcs_CorporateNotesAndBondsMember
|
| Short-Term Investments [Member] | Corporate Notes/Bonds [Member] | Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Investments |
2,683,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= jcs_CorporateNotesAndBondsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|
3,159,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= jcs_CorporateNotesAndBondsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|
| Long Term Investments [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Investments |
11,540,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= jcs_LongTermInvestmentsMember
|
3,921,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= jcs_LongTermInvestmentsMember
|
| Long Term Investments [Member] | Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Investments |
11,540,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= jcs_LongTermInvestmentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|
3,921,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= jcs_LongTermInvestmentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|
| Long Term Investments [Member] | Certificates Of Deposit [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Investments |
5,463,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= jcs_LongTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CertificatesOfDepositMember
|
1,197,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= jcs_LongTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CertificatesOfDepositMember
|
| Long Term Investments [Member] | Certificates Of Deposit [Member] | Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Investments |
5,463,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= jcs_LongTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|
1,197,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= jcs_LongTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|
| Long Term Investments [Member] | Corporate Notes/Bonds [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Investments |
6,077,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= jcs_LongTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= jcs_CorporateNotesAndBondsMember
|
2,724,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= jcs_LongTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= jcs_CorporateNotesAndBondsMember
|
| Long Term Investments [Member] | Corporate Notes/Bonds [Member] | Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Investments |
$ 6,077,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= jcs_LongTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= jcs_CorporateNotesAndBondsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|
$ 2,724,000us-gaap_InvestmentsFairValueDisclosure
/ jcs_AdditionalInvestmentInformationAxis
= jcs_LongTermInvestmentsMember
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= jcs_CorporateNotesAndBondsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
|