Note 10 - Retirement Plans (Details Textual) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Pension Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0	$ 0
Defined Contribution Plan, Expected Contributions, Remainder of Fiscal Year	0
401(k) Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	7,000
Defined Contribution Plan, Expected Contributions, Remainder of Fiscal Year	$ 18,000

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