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Note 15 - Subsequent Events (Details Textual) $ in Millions | 1 Months Ended
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Dec. 31, 2024 USD ($)
Leases at Gray Owned Tower Sites [Member] |
Proceeds from Lease Payment, Sales-Type and Direct Financing Leases, Investing Activity | $ 35

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- Definition Amount of cash inflow from principal payment received from sales-type and direct financing leases classified as investing activity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 4 -SubTopic 230 -Topic 942 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479024/942-230-45-4 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=gtn_LeasesAtGrayOwnedTowerSitesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |