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Note 9 - Retirement Plans (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 09, 2008 | May 02, 2007 | Dec. 31, 2013 | Dec. 31, 2012
Note 9 - Retirement Plans (Details) [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 66,813,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |  |  | 58,063,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |
Capital Accumulation Plan, Contributions, Vesting Period | 5 years |  |  |  |
Capital Accumulation Plan [Member] |  |  |  |  |
Note 9 - Retirement Plans (Details) [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in Shares) |  | 2,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_DefinedContributionPlanNameAxis = gtn_CapitalAccumulationPlanMember | 1,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_DefinedContributionPlanNameAxis = gtn_CapitalAccumulationPlanMember |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedContributionPlanNameAxis = gtn_CapitalAccumulationPlanMember |  |  |  |
Collective Bargaining [Member] |  |  |  |  |
Note 9 - Retirement Plans (Details) [Line Items] |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch / us-gaap_DefinedContributionPlanNameAxis = gtn_CollectiveBargainingMember |  |  | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch / us-gaap_DefinedContributionPlanNameAxis = gtn_CollectiveBargainingMember | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch / us-gaap_DefinedContributionPlanNameAxis = gtn_CollectiveBargainingMember
Minimum [Member] |  |  |  |  |
Note 9 - Retirement Plans (Details) [Line Items] |  |  |  |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year | 5,300,000 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Active Defined Benefit Pension Plan [Member] |  |  |  |  |
Note 9 - Retirement Plans (Details) [Line Items] |  |  |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation | 92,800,000 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gtn_ActiveDefinedBenefitPensionPlanMember |  |  | 72,200,000 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gtn_ActiveDefinedBenefitPensionPlanMember |
Defined Benefit Plan, Fair Value of Plan Assets | 66,813,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gtn_ActiveDefinedBenefitPensionPlanMember |  |  | 58,063,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gtn_ActiveDefinedBenefitPensionPlanMember | 46,662,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gtn_ActiveDefinedBenefitPensionPlanMember
Defined Benefit Plan, Benefit Obligation | 108,006,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gtn_ActiveDefinedBenefitPensionPlanMember |  |  | 83,533,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gtn_ActiveDefinedBenefitPensionPlanMember | 83,236,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gtn_ActiveDefinedBenefitPensionPlanMember
Acquired Pension Plans [Member] |  |  |  |  |
Note 9 - Retirement Plans (Details) [Line Items] |  |  |  |  |
Number of Underfunded Pension Plans | 2 gtn_NumberOfUnderfundedPensionPlans / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gtn_AcquiredPensionPlansMember |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 5,900,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gtn_AcquiredPensionPlansMember |  |  | 5,500,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gtn_AcquiredPensionPlansMember |
Defined Benefit Plan, Benefit Obligation | $ 8,000,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gtn_AcquiredPensionPlansMember |  |  | 6,900,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gtn_AcquiredPensionPlansMember |
Capital Accumulation Plan [Member] |  |  |  |  |
Note 9 - Retirement Plans (Details) [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) | 1,593,412 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gtn_CapitalAccumulationPlanMember |  |  |  |

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- Definition Represents the maximum period over which the Company's matching contributions vest (based upon each employee's number of years of service). + References No definition available. + Details
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- Definition Represents the number of underfunded pension plans. + References No definition available. + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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