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Note 2 - Acquisitions (Details) - Preliminary Fair Value Estimates of Acquired Assets, Assumed Liabilities and Resulting Goodwill (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended | 1 Months Ended |  |
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Jun. 13, 2014 | Dec. 31, 2014 | May 31, 2014 | Apr. 30, 2014 | Nov. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 2 - Acquisitions (Details) - Preliminary Fair Value Estimates of Acquired Assets, Assumed Liabilities and Resulting Goodwill [Line Items] |  |  |  |  |  |  |
Accounts receivable |  | $ 106,692 us-gaap_AccountsReceivableNetCurrent |  |  |  | $ 70,047 us-gaap_AccountsReceivableNetCurrent |
Property and equipment |  | 221,811 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 143,621 us-gaap_PropertyPlantAndEquipmentNet |
Goodwill |  | 374,390 us-gaap_Goodwill |  |  |  | 184,409 us-gaap_Goodwill | 170,522 us-gaap_Goodwill
Broadcast licenses |  | 1,023,580 us-gaap_IndefiniteLivedLicenseAgreements |  |  |  | 838,982 us-gaap_IndefiniteLivedLicenseAgreements |
Other non-current assets |  | 3,443 us-gaap_OtherAssetsNoncurrent |  |  |  | 3,289 us-gaap_OtherAssetsNoncurrent |
Current liabilities |  | (80,022)us-gaap_LiabilitiesCurrent |  |  |  | (63,085)us-gaap_LiabilitiesCurrent |
Other long-term liabilities |  | (952)us-gaap_OtherLiabilitiesNoncurrent |  |  |  | (827)us-gaap_OtherLiabilitiesNoncurrent |
Deferred income tax liabilities |  | (292,679)us-gaap_DeferredTaxLiabilitiesNoncurrent |  |  |  | (225,407)us-gaap_DeferredTaxLiabilitiesNoncurrent |
Hoak Acquisition [Member] |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) - Preliminary Fair Value Estimates of Acquired Assets, Assumed Liabilities and Resulting Goodwill [Line Items] |  |  |  |  |  |  |
Accounts receivable |  | 10,722 us-gaap_AccountsReceivableNetCurrent / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember |  |  |  |  |
Other current assets |  | 509 us-gaap_OtherAssetsCurrent / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember |  |  |  |  |
Property and equipment |  | 45,382 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember |  |  |  |  |
Goodwill |  | 131,632 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember |  |  |  |  |
Broadcast licenses |  | 91,958 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember |  |  |  |  |
Other intangible assets |  | 35,386 us-gaap_OtherIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember |  |  |  |  |
Current liabilities |  | (3,544)us-gaap_LiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember |  |  |  |  |
Deferred income tax liabilities |  | (12,188)us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember |  |  |  |  |
Total | 299,900 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember | 299,857 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_HoakAcquisitionMember |  |  |  |  |
SJL Acquisition [Member] |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) - Preliminary Fair Value Estimates of Acquired Assets, Assumed Liabilities and Resulting Goodwill [Line Items] |  |  |  |  |  |  |
Accounts receivable |  | 7,132 us-gaap_AccountsReceivableNetCurrent / us-gaap_BusinessAcquisitionAxis = gtn_SJLAcquisitionMember |  |  |  |  |
Other current assets |  | 1,946 us-gaap_OtherAssetsCurrent / us-gaap_BusinessAcquisitionAxis = gtn_SJLAcquisitionMember |  |  |  |  |
Property and equipment |  | 23,508 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_BusinessAcquisitionAxis = gtn_SJLAcquisitionMember |  |  |  |  |
Goodwill |  | 50,941 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = gtn_SJLAcquisitionMember |  |  |  |  |
Broadcast licenses |  | 86,685 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_BusinessAcquisitionAxis = gtn_SJLAcquisitionMember |  |  |  |  |
Other intangible assets |  | 10,091 us-gaap_OtherIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = gtn_SJLAcquisitionMember |  |  |  |  |
Other non-current assets |  | 253 us-gaap_OtherAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = gtn_SJLAcquisitionMember |  |  |  |  |
Current liabilities |  | (4,936)us-gaap_LiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = gtn_SJLAcquisitionMember |  |  |  |  |
Other long-term liabilities |  | (379)us-gaap_OtherLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = gtn_SJLAcquisitionMember |  |  |  |  |
Deferred income tax liabilities |  | (43,712)us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = gtn_SJLAcquisitionMember |  |  |  |  |
Total |  | 131,529 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_SJLAcquisitionMember |  |  |  |  |
KEVN Acquisition [Member] |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) - Preliminary Fair Value Estimates of Acquired Assets, Assumed Liabilities and Resulting Goodwill [Line Items] |  |  |  |  |  |  |
Cash |  | 615 us-gaap_Cash / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember |  |  |  |  |
Accounts receivable |  | 569 us-gaap_AccountsReceivableNetCurrent / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember |  |  |  |  |
Other current assets |  | 96 us-gaap_OtherAssetsCurrent / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember |  |  |  |  |
Property and equipment |  | 3,888 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember |  |  |  |  |
Goodwill |  | 2,717 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember |  |  |  |  |
Broadcast licenses |  | 1,675 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember |  |  |  |  |
Other intangible assets |  | 1,786 us-gaap_OtherIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember |  |  |  |  |
Other non-current assets |  | 29 us-gaap_OtherAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember |  |  |  |  |
Current liabilities |  | (211)us-gaap_LiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember |  |  |  |  |
Other long-term liabilities |  | (38)us-gaap_OtherLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember |  |  |  |  |
Deferred income tax liabilities |  | (2,341)us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember |  |  |  |  |
Total |  | 8,785 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember | 8,800 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_KEVNAcquisitionMember |  |  |  |
KNDX Acquisition [Member] |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) - Preliminary Fair Value Estimates of Acquired Assets, Assumed Liabilities and Resulting Goodwill [Line Items] |  |  |  |  |  |  |
Other current assets |  | 39 us-gaap_OtherAssetsCurrent / us-gaap_BusinessAcquisitionAxis = gtn_KNDXAcquisitionMember |  |  |  |  |
Property and equipment |  | 2,576 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_BusinessAcquisitionAxis = gtn_KNDXAcquisitionMember |  |  |  |  |
Goodwill |  | 1,839 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = gtn_KNDXAcquisitionMember |  |  |  |  |
Broadcast licenses |  | 500 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_BusinessAcquisitionAxis = gtn_KNDXAcquisitionMember |  |  |  |  |
Other intangible assets |  | 2,584 us-gaap_OtherIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = gtn_KNDXAcquisitionMember |  |  |  |  |
Other non-current assets |  | 15 us-gaap_OtherAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = gtn_KNDXAcquisitionMember |  |  |  |  |
Current liabilities |  | (36)us-gaap_LiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = gtn_KNDXAcquisitionMember |  |  |  |  |
Other long-term liabilities |  | (17)us-gaap_OtherLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = gtn_KNDXAcquisitionMember |  |  |  |  |
Total |  | 7,500 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_KNDXAcquisitionMember | 7,500 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_KNDXAcquisitionMember |  |  |  |
Parker Acquisitions [Member] |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) - Preliminary Fair Value Estimates of Acquired Assets, Assumed Liabilities and Resulting Goodwill [Line Items] |  |  |  |  |  |  |
Accounts receivable |  | 765 us-gaap_AccountsReceivableNetCurrent / us-gaap_BusinessAcquisitionAxis = gtn_ParkerAcquisitionsMember |  |  |  |  |
Other current assets |  | 964 us-gaap_OtherAssetsCurrent / us-gaap_BusinessAcquisitionAxis = gtn_ParkerAcquisitionsMember |  |  |  |  |
Property and equipment |  | 722 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_BusinessAcquisitionAxis = gtn_ParkerAcquisitionsMember |  |  |  |  |
Goodwill |  | 1,932 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = gtn_ParkerAcquisitionsMember |  |  |  |  |
Other intangible assets |  | 3,163 us-gaap_OtherIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = gtn_ParkerAcquisitionsMember |  |  |  |  |
Other non-current assets |  | 16 us-gaap_OtherAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = gtn_ParkerAcquisitionsMember |  |  |  |  |
Current liabilities |  | (826)us-gaap_LiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = gtn_ParkerAcquisitionsMember |  |  |  |  |
Other long-term liabilities |  | (5)us-gaap_OtherLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = gtn_ParkerAcquisitionsMember |  |  |  |  |
Total |  | 6,731 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_ParkerAcquisitionsMember |  |  |  |  |
WQCW Acquisition [Member] |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) - Preliminary Fair Value Estimates of Acquired Assets, Assumed Liabilities and Resulting Goodwill [Line Items] |  |  |  |  |  |  |
Other current assets |  | 45 us-gaap_OtherAssetsCurrent / us-gaap_BusinessAcquisitionAxis = gtn_WQCWAcquisitionMember |  |  |  |  |
Property and equipment |  | 991 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_BusinessAcquisitionAxis = gtn_WQCWAcquisitionMember |  |  |  |  |
Goodwill |  | 802 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = gtn_WQCWAcquisitionMember |  |  |  |  |
Broadcast licenses |  | 3,691 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_BusinessAcquisitionAxis = gtn_WQCWAcquisitionMember |  |  |  |  |
Other intangible assets |  | 15 us-gaap_OtherIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = gtn_WQCWAcquisitionMember |  |  |  |  |
Current liabilities |  | (45)us-gaap_LiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = gtn_WQCWAcquisitionMember |  |  |  |  |
Total |  | 5,499 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_WQCWAcquisitionMember |  | 5,500 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_WQCWAcquisitionMember |  |  |
Helena Acquisition [Member] |  |  |  |  |  |  |
Note 2 - Acquisitions (Details) - Preliminary Fair Value Estimates of Acquired Assets, Assumed Liabilities and Resulting Goodwill [Line Items] |  |  |  |  |  |  |
Accounts receivable |  | 14 us-gaap_AccountsReceivableNetCurrent / us-gaap_BusinessAcquisitionAxis = gtn_HelenaAcquisitionMember |  |  |  |  |
Other current assets |  | 49 us-gaap_OtherAssetsCurrent / us-gaap_BusinessAcquisitionAxis = gtn_HelenaAcquisitionMember |  |  |  |  |
Property and equipment |  | 1,230 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_BusinessAcquisitionAxis = gtn_HelenaAcquisitionMember |  |  |  |  |
Goodwill |  | 70 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = gtn_HelenaAcquisitionMember |  |  |  |  |
Broadcast licenses |  | 146 us-gaap_IndefiniteLivedLicenseAgreements / us-gaap_BusinessAcquisitionAxis = gtn_HelenaAcquisitionMember |  |  |  |  |
Other intangible assets |  | 431 us-gaap_OtherIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = gtn_HelenaAcquisitionMember |  |  |  |  |
Current liabilities |  | (90)us-gaap_LiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = gtn_HelenaAcquisitionMember |  |  |  |  |
Total |  | $ 1,850 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_HelenaAcquisitionMember |  |  | $ 1,900 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gtn_HelenaAcquisitionMember |  |

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