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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended | 0 Months Ended |  |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 15, 2014 | Oct. 31, 2013 | Jun. 30, 2014
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |
Advertising Expense | $ 1,100,000 us-gaap_AdvertisingExpense | $ 900,000 us-gaap_AdvertisingExpense | $ 900,000 us-gaap_AdvertisingExpense |  |  |
undefined | 120 days |  |  |  |  |
undefined | 85.00%gtn_MinimumPercentageOfReceivableBalancesForCreatingAllowanceForDoubtfulAccounts |  |  |  |  |
Provision for Doubtful Accounts | 1,300,000 us-gaap_ProvisionForDoubtfulAccounts | 400,000 us-gaap_ProvisionForDoubtfulAccounts | 100,000 us-gaap_ProvisionForDoubtfulAccounts |  |  |
Property, Plant and Equipment, Additions | 78,300,000 us-gaap_PropertyPlantAndEquipmentAdditions |  |  |  |  |
Asset Retirement Obligation | 600,000 us-gaap_AssetRetirementObligation | 516,000 us-gaap_AssetRetirementObligation |  |  |  |
Asset Retirement Obligation, Accretion Expense | 6,000 us-gaap_AssetRetirementObligationAccretionExpense | 17,000 us-gaap_AssetRetirementObligationAccretionExpense | 25,000 us-gaap_AssetRetirementObligationAccretionExpense |  |  |
Excalibur [Member] | KJCT [Member] | Broadcast Licenses [Member] |  |  |  |  |  |
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  | 3,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = gtn_KJCTMember / us-gaap_FairValueByAssetClassAxis = gtn_BroadcastLicensesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gtn_ExcaliburMember |
Excalibur [Member] |  |  |  |  |  |
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |
Guarantor Obligations, Current Carrying Value |  |  |  |  | 3,000,000 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gtn_ExcaliburMember |
Variable Interest Entity, Measure of Activity, Revenues | 2,100,000 us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityRevenues / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gtn_ExcaliburMember | 400,000 us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityRevenues / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gtn_ExcaliburMember |  |  |  |
Variable Interest Entity, Purchase of Assets by Reporting Entity |  |  |  | 3,000,000 gtn_VariableInterestEntityPurchaseOfAssetsByReportingEntity / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gtn_ExcaliburMember |  |
Liabilities of Business Transferred under Contractual Arrangement, Noncurrent |  | 3,100,000 us-gaap_LiabilitiesOfBusinessTransferredUnderContractualArrangementNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gtn_ExcaliburMember |  |  |  |
Due to Related Parties, Current |  | 700,000 us-gaap_DueToRelatedPartiesCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = gtn_ExcaliburMember |  |  |  |
Common Stock [Member] | Tarzian Inc [Member] |  |  |  |  |  |
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |
Cost Method Ownership Percentage |  |  |  |  |  | 32.40%gtn_CostMethodOwnershipPercentage / invest_InvestmentAxis = gtn_TarzianIncMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Dividends, Liquidation/Dissolution [Member] | Tarzian Inc [Member] |  |  |  |  |  |
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |
Cost Method Ownership Percentage |  |  |  |  |  | 67.90%gtn_CostMethodOwnershipPercentage / invest_InvestmentAxis = gtn_TarzianIncMember / us-gaap_StatementEquityComponentsAxis = gtn_DividendsLiquidationDissolutionMember
Automotive [Member] | Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |
Concentration Risk, Percentage | 26.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = gtn_AutomotiveMember |  |  |  |  |
Advertising [Member] | Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |
Concentration Risk, Percentage | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = gtn_AdvertisingMember |  |  |  |  |
Medical [Member] | Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |
Concentration Risk, Percentage | 9.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = gtn_MedicalMember |  |  |  |  |
KJCT [Member] | Non-license Assets [Member] |  |  |  |  |  |
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |
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 |

X
- Definition No authoritative reference available. + References No definition available. + Details
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- Definition The element representing the Company's minimum percentage of receivable balances for creating allowance for doubtful accounts. + References No definition available. + Details
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- Definition The element representing the Company's period for creating allowance for doubtful accounts. + References No definition available. + Details
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- Definition Represents the amount paid by the reporting entity to purchase the outstanding indebtedness of the VIE, which was then retired, resulting in the reporting entity's guarantee of the VIE's debt. + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition The noncurrent portion, due in greater than one year or one operating cycle, if longer, of liabilities resulting from the transfer of a business segment under contractual arrangement where the transferor maintains certain risks, obligations, or liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section E + Details
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- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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- Definition The amount of income between the reporting entity and the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph d -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5747-111685 + Details
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- Details
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