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Note 2 - Revenue (Details Textual) $ in Millions | Dec. 31, 2024 USD ($)
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Deferred Revenue [Member] |
Deposit Liability, Current | $ 13

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- Definition The current portion, due within one year or one operating cycle, if longer, of deposits held other than customer deposits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_DepositLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=gtn_DeferredRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |