Note 1 - Basis of Presentation (Details) - 6 months ended Jun. 30, 2015	Total
Disclosure Text Block [Abstract]
Minimum Percentage of Receivable Balances for Creating Allowance For Doubtful Accounts	85.00%
Period For Creating Allowance For Doubtful Accounts	120 days

The element representing the Company's minimum percentage of receivable balances for creating allowance for doubtful accounts.

No definition available.

Name:	gtn_MinimumPercentageOfReceivableBalancesForCreatingAllowanceForDoubtfulAccounts
Namespace Prefix:	gtn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration