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

Amount of increase in value of stock that has been authorized by the repurchase plan.

No definition available.

Name:	gtn_StockRepurchaseProgramIncreaseInAuthorizedAmount
Namespace Prefix:	gtn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration