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Note 2 - Acquisitions (Details) (USD $) | 3 Months Ended | 12 Months Ended | 7 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 13 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Jun. 13, 2014 | Sep. 15, 2014 | May 31, 2014 | Apr. 30, 2014 | Nov. 30, 2014 | Oct. 02, 2014 | Oct. 31, 2013 | Oct. 31, 2014 | Dec. 15, 2014
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) | $ 72,021,000 us-gaap_OperatingIncomeLoss | $ 41,156,000 us-gaap_OperatingIncomeLoss | $ 23,186,000 us-gaap_OperatingIncomeLoss | $ 17,410,000 us-gaap_OperatingIncomeLoss | $ 23,288,000 us-gaap_OperatingIncomeLoss | $ 24,220,000 us-gaap_OperatingIncomeLoss | $ 21,312,000 us-gaap_OperatingIncomeLoss | $ 15,060,000 us-gaap_OperatingIncomeLoss | $ 153,773,000 us-gaap_OperatingIncomeLoss | $ 83,880,000 us-gaap_OperatingIncomeLoss | $ 153,441,000 us-gaap_OperatingIncomeLoss |  |  |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  |  |  |  | (5,086,000)us-gaap_GainsLossesOnExtinguishmentOfDebt |  | (46,683,000)us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property |  |  |  |  |  |  |  |  | (623,000)us-gaap_GainLossOnDispositionOfAssets | (765,000)us-gaap_GainLossOnDispositionOfAssets | 31,000 us-gaap_GainLossOnDispositionOfAssets |  |  |  |  |  |  |  |  |  |
Corporate and Administrative Expenses [Member] | 2014 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  | 6,200,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = gtn_The2014AcquisitionsMember / us-gaap_IncomeStatementLocationAxis = gtn_CorporateAndAdministrativeExpensesMember |  |  |  |  |  |  |  |  |  |  |  |
Operating Expense [Member] | Hoak Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  |  | 5,100,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember |  |  |  |  |  |  |  |  |
Allocated to Parker Broadcasting of Dakota [Member] | Parker Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  | 5,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_ParkerAcquisitionsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gtn_AllocatedToParkerBroadcastingOfDakotaMember |  |  |  |  |  |  |  |  |  |  |  |
Allocated to Parker Broadcasting of Louisiana [Member] | Parker Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  | 1,700,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_ParkerAcquisitionsMember / us-gaap_StatementScenarioAxis = gtn_AllocatedToParkerBroadcastingOfLouisianaMember |  |  |  |  |  |  |  |  |  |  |  |
Retransmission Agreements [Member] | 2014 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |  | 34,200,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = gtn_The2014AcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gtn_RetransmissionAgreementsMember |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  | 4 years 146 days |  |  |  |  |  |  |  |  |  |  |  |
Retransmission Agreements [Member] | 2013 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  |  | 1 year 292 days |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets, Fair Value Disclosure |  |  |  |  | 1,400,000 us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure / us-gaap_BusinessAcquisitionAxis = gtn_The2013AcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gtn_RetransmissionAgreementsMember |  |  |  |  | 1,400,000 us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure / us-gaap_BusinessAcquisitionAxis = gtn_The2013AcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gtn_RetransmissionAgreementsMember |  |  |  |  |  |  |  |  |  |  |
Advertising Relationships [Member] | 2014 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |  | 13,100,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = gtn_The2014AcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gtn_AdvertisingRelationshipsMember |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  | 5 years 6 months |  |  |  |  |  |  |  |  |  |  |  |
Advertising Relationships [Member] | 2013 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  |  | 7 years 36 days |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets, Fair Value Disclosure |  |  |  |  | 600,000 us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure / us-gaap_BusinessAcquisitionAxis = gtn_The2013AcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gtn_AdvertisingRelationshipsMember |  |  |  |  | 600,000 us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure / us-gaap_BusinessAcquisitionAxis = gtn_The2013AcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gtn_AdvertisingRelationshipsMember |  |  |  |  |  |  |  |  |  |  |
Off-Market Favorable Lease [Member] | 2014 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |  | 4,100,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = gtn_The2014AcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OffMarketFavorableLeaseMember |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  | 8 years 109 days |  |  |  |  |  |  |  |  |  |  |  |
Hoak Acquisition [Member] | Nexstar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration Not Included in Purchase Price, Paid by Another Entity |  |  |  |  |  |  |  |  |  |  |  |  | 33,500,000 gtn_ConsiderationNotIncludedInPurchasePricePaidByAnotherEntity / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember / us-gaap_CounterpartyNameAxis = gtn_NexstarMember |  |  |  |  |  |  |  |
Hoak Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  | 299,857,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember |  |  |  | 299,900,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  |  |  |  |  |  | 64,700,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax |  |  |  |  |  |  |  |  |  |  |  | 25,800,000 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember |  |  |  |  |  |  |  |  |
WJRT Acquisition, Inc. and WTVG Acquisition, Inc. [Member] | Pay-off of Acquired Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,100,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_WJRTAcquisitionIncAndWTVGAcquisitionIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = gtn_PayOffOfAcquiredDebtMember |  |  |  |  |  |  |
WJRT Acquisition, Inc. and WTVG Acquisition, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = gtn_WJRTAcquisitionIncAndWTVGAcquisitionIncMember |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  |  |  | 131,500,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_WJRTAcquisitionIncAndWTVGAcquisitionIncMember |  |  |  |  |  |  |
KEVN Acquisition [Member] | Pay-off of Acquired Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,600,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = gtn_PayOffOfAcquiredDebtMember |  |  |  |  |  |
KEVN Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  | 8,785,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember |  |  |  |  |  | 8,800,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember |  |  |  |  |  |
KNDX Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  | 7,500,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_KNDXAcquisitionMember |  |  |  |  |  | 7,500,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_KNDXAcquisitionMember |  |  |  |  |  |
Parker Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = gtn_ParkerAcquisitionsMember |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = gtn_ParkerAcquisitionsMember |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = gtn_ParkerAcquisitionsMember |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  | 6,731,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_ParkerAcquisitionsMember |  |  |  |  |  |  |  |  |  |  |  |
WQCW Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  | 5,499,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_WQCWAcquisitionMember |  |  |  |  |  |  | 5,500,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_WQCWAcquisitionMember |  |  |  |  |
Helena Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  | 1,850,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_HelenaAcquisitionMember |  |  |  |  |  |  |  | 1,900,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_HelenaAcquisitionMember |  |  |  |
2014 Acquisitions [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
2014 Acquisitions [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 40 years |  |  |  |  |  |  |  |  |  |  |  |
2014 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Contractual Amounts in Excess of Fair Value | 300,000 gtn_AccountsReceivableContractualAmountsInExcessOfFairValue / us-gaap_BusinessAcquisitionAxis = gtn_The2014AcquisitionsMember |  |  |  |  |  |  |  | 300,000 gtn_AccountsReceivableContractualAmountsInExcessOfFairValue / us-gaap_BusinessAcquisitionAxis = gtn_The2014AcquisitionsMember |  |  | 300,000 gtn_AccountsReceivableContractualAmountsInExcessOfFairValue / us-gaap_BusinessAcquisitionAxis = gtn_The2014AcquisitionsMember |  |  |  |  |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | 88,600,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = gtn_The2014AcquisitionsMember |  |  |  |  |  |  |  | 88,600,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = gtn_The2014AcquisitionsMember |  |  | 88,600,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = gtn_The2014AcquisitionsMember |  |  |  |  |  |  |  |  |
Acquired Intangible Assets, Measurement Period for Finalization of Preliminary Valuations |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Yellowstone [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  | 32,739,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_YellowstoneMember |  |  |  |  |  |  |  | 10,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_YellowstoneMember | 23,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_YellowstoneMember | 32,700,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_YellowstoneMember |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = gtn_YellowstoneMember |  |
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / us-gaap_BusinessAcquisitionAxis = gtn_YellowstoneMember |  |
Subsidiary or Equity Method Investee, Additional Percentage Ownership from Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00%gtn_SubsidiaryOrEquityMethodInvesteeAdditionalPercentageOwnershipFromTransaction / us-gaap_BusinessAcquisitionAxis = gtn_YellowstoneMember |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 2,400,000 us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = gtn_YellowstoneMember |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  | 700,000 us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = gtn_YellowstoneMember |  |  |  |  |  |  |  |  |  |  |
KJCT [Member] | Non-license Assets [Member] | Excalibur [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = gtn_KJCTMember / us-gaap_FairValueByAssetClassAxis = gtn_NonLicenseAssetsMember / dei_LegalEntityAxis = gtn_ExcaliburMember |  |
KJCT [Member] | Non-license Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = gtn_KJCTMember / us-gaap_FairValueByAssetClassAxis = gtn_NonLicenseAssetsMember |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = gtn_KJCTMember / us-gaap_FairValueByAssetClassAxis = gtn_NonLicenseAssetsMember |  |
KJCT [Member] | Excalibur [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for (Proceeds from) Derivative Instrument, Investing Activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities / us-gaap_BusinessAcquisitionAxis = gtn_KJCTMember / us-gaap_CounterpartyNameAxis = gtn_ExcaliburMember |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = gtn_KJCTMember / us-gaap_CounterpartyNameAxis = gtn_ExcaliburMember
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (200,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_BusinessAcquisitionAxis = gtn_KJCTMember / us-gaap_CounterpartyNameAxis = gtn_ExcaliburMember
KJCT [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  | 12,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_KJCTMember |  |  |  |  |  |  |  |  | 12,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_KJCTMember |  |
Revenues |  |  |  |  |  |  |  |  |  | 400,000 us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = gtn_KJCTMember |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  | 200,000 us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = gtn_KJCTMember |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Machinery and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000 us-gaap_ProceedsFromSaleOfMachineryAndEquipment / us-gaap_BusinessAcquisitionAxis = gtn_KJCTMember
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property |  |  |  |  |  |  |  |  | $ (269,000)us-gaap_GainLossOnDispositionOfAssets / us-gaap_BusinessAcquisitionAxis = gtn_KJCTMember |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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