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Note 3 - Acquisitions and Divestitures - Transaction Related Expenses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021
Transaction related expenses | $ 11 | $ 26
Broadcast Licenses [Member] |  |
Transaction related expenses | 0 | 0
Corporate and Administrative [Member] |  |
Transaction related expenses | 11 | 19
Miscellaneous (Income) Expense, Net [Member] |  |
Transaction related expenses | 0 | 7
Legal, Consulting and Other Professional Fees [Member] |  |
Transaction related expenses | 11 | 19
Incentive Compensation and Severance Costs [Member] |  |
Transaction related expenses | 0 | 0
Termination of Sales Representation Agreements [Member] |  |
Transaction related expenses | $ 0 | $ 7

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
Name: | us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=gtn_CorporateAndAdministrativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |