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Note 1 - Basis of Presentation (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Property, Plant and Equipment, Additions	$ 99.4
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

Name:	gtn_MinimumPercentageOfReceivableBalancesForCreatingAllowanceForDoubtfulAccounts
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