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Note 7 - Retirement Plans (Details Textual) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Defined Contribution Plan, Expected Contributions, Remainder of Fiscal Year | $ 6 |
Profit Sharing Contribution [Member] |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 22 | $ 9

X
- Definition Amount of the employer's best estimate of contributions expected to be paid to the plan during the remainder of the current fiscal year. + References No definition available. + Details
Name: | gtn_DefinedContributionPlanExpectedContributionsRemainderOfFiscalYear
Namespace Prefix: | gtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_PlanNameAxis=gtn_ProfitSharingContributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |