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Note 1 - Description of Business and Summary of Significant Accounting Policies - Trade Revenue and Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Trade revenue | $ 5 | $ 8 | $ 3
Trade expense | (5) | (8) | (3)
Net trade income (loss) | $ 0 | $ 0 | $ 0

X
- Definition Net trade income (loss) amount recognized from advertising barter transactions for each income statement presented. + References No definition available. + Details
Name: | gtn_AdvertisingBarterTransactionsNetTradeIncomeLoss
Namespace Prefix: | gtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total trade expense recognized from advertising barter transactions for each income statement presented. + References No definition available. + Details
Name: | gtn_AdvertisingBarterTransactionsTradeExpense
Namespace Prefix: | gtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total trade revenue recognized from advertising barter transactions for each income statement presented. + References No definition available. + Details
Name: | gtn_AdvertisingBarterTransactionsTradeRevenue
Namespace Prefix: | gtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration