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Note 1 - Basis of Presentation - Proceeds Received for Project (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Proceeds from asset sold | $ 7 | $ 8
Sale Agreement with the Doraville Community Improvement District [Member] |  |
Proceeds from asset sold | 5 | 6
Proceeds received in advance of asset sale | 0 | 9
Total proceeds received for asset transfer to CID | 5 | 15
Proceeds for reimbursement of development costs | 0 | 11
Total proceeds received from CID | $ 5 | $ 26

X
- Definition The amount of advance proceeds received from asset sale. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of proceeds for reimbursement of development costs. + References No definition available. + Details
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Namespace Prefix: | gtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of proceeds received for asset transfer. + References No definition available. + Details
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Namespace Prefix: | gtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of total proceeds from project. + References No definition available. + Details
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Namespace Prefix: | gtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-12 + Details
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |