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Note 9 - Retirement Plans (Details) - Matching Contributions (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Matching Contributions [Abstract]
Matching contributions to the Capital Accumulation Plan	2,341us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan	5,235us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan	14,293us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
Matching contributions to the Capital Accumulation Plan	$ 25us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan	$ 28us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan	$ 26us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan

X

- Details

Name:	gtn_MatchingContributionsAbstract
Namespace Prefix:	gtn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Value of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration