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

Amount of the employer's best estimate of contributions expected to be paid to the plan during the remainder of the current fiscal year.

No definition available.

Name:	gtn_DefinedContributionPlanExpectedContributionsRemainderOfFiscalYear
Namespace Prefix:	gtn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant