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Note 10 - Commitments and Contingencies (Details Textual) $ in Millions | Sep. 30, 2020 USD ($)
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Acquisition and Investments Commitments | $ 80

X
- Definition The amount of commitments related to acquisition and investments. + References No definition available. + Details
Name: | gtn_AcquisitionAndInvestmentsCommitments
Namespace Prefix: | gtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant