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Note 10 - Subsequent Event (Details Textual) $ in Millions | Nov. 06, 2016 USD ($)
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Subsequent Event [Member] |
Stock Repurchase Program, Increase in Authorized Amount | $ 75

X
- Definition Amount of increase in value of stock that has been authorized by the repurchase plan. + References No definition available. + Details
Name: | gtn_StockRepurchaseProgramIncreaseInAuthorizedAmount
Namespace Prefix: | gtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |