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Stock-Based Compensation (Narrative) (Details) (USD $)
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3 Months Ended | 1 Months Ended | 0 Months Ended | 12 Months Ended | |
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Mar. 31, 2015
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Mar. 31, 2014
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Apr. 30, 2015
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Apr. 03, 2015
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Dec. 31, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Number of options outstanding | 635,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 540,404us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | |||
| Aggregate intrinsic value of options outstanding | $ 158,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue | ||||
| Intrinsic value of all options exercised | 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | ||||
| Net cash proceeds from exercise of stock options | 0us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | 0us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | |||
| Unrecognized compensation expense for awards | 1,204,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions | ||||
| Recognition period for unrecognized compensation expense | 2 years 8 months 12 days | ||||
| Excess tax benefits from exercise of stock options | (6,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions | (9,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions | |||
| Share based compensation expense before income taxes | 238,000us-gaap_AllocatedShareBasedCompensationExpense | 48,000us-gaap_AllocatedShareBasedCompensationExpense | |||
| Share based compensation expense after income taxes | $ 155,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | $ 31,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | |||
| Employee Stock Purchase Plan [Member] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Percentage of price of common stock at which employees are able to acquire |
85.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
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| Shares available |
17,455us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
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| Employee Stock Purchase Plan [Member] | Subsequent Event [Member] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Number of additional awards authorized |
100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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| Number of awards authorized |
600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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| 2011 Executive Incentive Compensation Plan [Member] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Number of awards authorized |
1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = jcs_TwoThousandElevenExecutiveIncentiveCompensationPlanMember |
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| Award vesting percentage |
25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_PlanNameAxis = jcs_TwoThousandElevenExecutiveIncentiveCompensationPlanMember |
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| Awards eligible for grant |
133,056us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = jcs_TwoThousandElevenExecutiveIncentiveCompensationPlanMember |
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| Shares issued under Plan |
65,651us-gaap_SharesIssued / us-gaap_PlanNameAxis = jcs_TwoThousandElevenExecutiveIncentiveCompensationPlanMember |
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| Number of options outstanding |
801,293us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = jcs_TwoThousandElevenExecutiveIncentiveCompensationPlanMember |
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| 2011 Executive Incentive Compensation Plan [Member] | Subsequent Event [Member] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Number of additional awards authorized |
1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = jcs_TwoThousandElevenExecutiveIncentiveCompensationPlanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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| Number of awards authorized |
2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = jcs_TwoThousandElevenExecutiveIncentiveCompensationPlanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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| Stock Option Plan For Directors [Member] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Number of options granted |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = jcs_StockOptionPlanForDirectorsMember |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = jcs_StockOptionPlanForDirectorsMember |
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| Award expiration period | 10 years | ||||
| 1992 Stock Plan [Member] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Shares available |
22,008us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = jcs_NineteenNinetyTwoStockPlanMember |
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| Number of options granted |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = jcs_NineteenNinetyTwoStockPlanMember |
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| Deferred stock awards granted |
0us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued / us-gaap_PlanNameAxis = jcs_NineteenNinetyTwoStockPlanMember |
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| Key Employees [Member] | 2011 Executive Incentive Compensation Plan [Member] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Deferred stock awards granted |
100,017us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued / us-gaap_PlanNameAxis = jcs_TwoThousandElevenExecutiveIncentiveCompensationPlanMember / us-gaap_TitleOfIndividualAxis = jcs_KeyEmployeesMember |
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| Key Executive Employees [Member] | 2011 Executive Incentive Compensation Plan [Member] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Number of options granted |
105,279us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = jcs_TwoThousandElevenExecutiveIncentiveCompensationPlanMember / us-gaap_TitleOfIndividualAxis = jcs_KeyExecutiveEmployeesMember |
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| Award expiration period | 7 years | ||||
| Deferred Stock [Member] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Awards granted |
100,017us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
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| X | ||||||||||
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- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. No definition available.
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- Definition
Aggregate number of common shares reserved for future issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of shares issued pursuant to the terms of a deferred compensation arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. No definition available.
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- Definition
Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of vesting of share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Discount rate from fair value on offering date that participants pay for shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of additional shares authorized for issuance under an established share-based compensation plan. No definition available.
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- Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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