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Note 1 - Basis of Presentation (Details Textual) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015
Property, Plant and Equipment, Additions | $ 102.7 | $ 16.0
Property, Plant and Equipment, Disposals | $ 3.7 |
Minimum Percentage of Receivable Balances for creating Allowance for Doubtful Accounts | 85.00% |
Period for Creating Allowance for Doubtful Accounts | 120 days |

X
- Definition Minimum percentage of receivable balances for creating allowance for doubtful accounts. + References No definition available. + Details
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Namespace Prefix: | gtn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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
- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentDisposals
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration