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Note 1 - Basis of Presentation (Details) | 3 Months Ended
--- | ---
Mar. 31, 2015
Disclosure Text Block [Abstract] |
Minimum Percentage of Receivable Balances for Creating Allowance For Doubtful Accounts | 85.00%gtn_MinimumPercentageOfReceivableBalancesForCreatingAllowanceForDoubtfulAccounts
Period For Creating Allowance For Doubtful Accounts | 120 days

X
- Definition The element representing the Company's minimum percentage of receivable balances for creating allowance for doubtful accounts. + References No definition available. + Details
Name: | gtn_MinimumPercentageOfReceivableBalancesForCreatingAllowanceForDoubtfulAccounts
Namespace Prefix: | gtn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element representing the Company's period for creating allowance for doubtful accounts. + References No definition available. + Details
Name: | gtn_PeriodForCreatingAllowanceForDoubtfulAccounts
Namespace Prefix: | gtn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DisclosureTextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration