Name:	gtn_Note5StockbasedCompensationDetailsLineItems
Namespace Prefix:	gtn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Note 5 - Stock-based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified		1 Months Ended			1 Months Ended	3 Months Ended				3 Months Ended							1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 19, 2016 Scenario, Forecast [Member] Restricted Stock [Member]	Mar. 19, 2015 Scenario, Forecast [Member] Restricted Stock [Member]	Mar. 31, 2014 Restricted Stock [Member] Director [Member] Common Class A [Member]	Jan. 31, 2014 Restricted Stock [Member] Director [Member]	Mar. 31, 2013 Restricted Stock [Member] Director [Member]	Mar. 31, 2014 Restricted Stock [Member] Common Class A [Member] Employee [Member] January 17, 2015 [Member]	Mar. 31, 2014 Restricted Stock [Member] Common Class A [Member] Employee [Member] January 17, 2016 [Member]	Mar. 31, 2014 Restricted Stock [Member] Common Class A [Member] Employee [Member] January 17, 2017 [Member]	Mar. 31, 2014 Restricted Stock [Member] Common Class A [Member] Employee [Member]	Mar. 31, 2014 Restricted Stock [Member] Common Class A [Member] Director [Member]	Mar. 31, 2014 Restricted Stock [Member] Common Class A [Member]	Mar. 31, 2013 Restricted Stock [Member] Common Class A [Member]	Mar. 31, 2014 Restricted Stock [Member] January 17, 2015 [Member]	Mar. 31, 2014 Restricted Stock [Member] January 17, 2016 [Member]	Mar. 31, 2014 Restricted Stock [Member] January 17, 2017 [Member]	Mar. 19, 2014 Restricted Stock [Member]	Mar. 31, 2014 Restricted Stock [Member]	Mar. 31, 2013 Restricted Stock [Member]	Dec. 31, 2013 Restricted Stock [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period						63,210				194,413	41,881	236,294	0					312,961	318,852
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		70,542	70,542		63,210					31,821		31,821	0				70,542	68,991		107,224
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number				41,881			75,412	43,590	43,590					127,316	58,327	58,327
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value (in Dollars)	$ 2.3