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Note 9 - Commitments and Contingencies (Details Textual) $ in Millions | Mar. 31, 2023 USD ($)
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Atlanta Assembly Project [Member] |
Loss Contingency Accrual | $ 18

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-1 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-10 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_LitigationCaseAxis=gtn_AtlantaAssemblyProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |