Amount of the employer's best estimate of contributions expected to be paid to the plan in the current fiscal period.

No definition available.

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Namespace Prefix:	gtn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
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Period Type:

- Details

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Namespace Prefix:
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Period Type:

- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
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Note 6 - Retirement Plans (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
Note 6 - Retirement Plans (Details Textual) - USD ($)	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
First 3% of Each Employee's Salary Deferral [Member] \| Capital Accumulation Plan [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Matched by the Company at the Rate of 100% [Member] \| Capital Accumulation Plan [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%
Next 2% of Each Employee's Salary Deferral [Member] \| Capital Accumulation Plan [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Next 2% of Each Employee's Salary Deferral [Member] \| Matched by the Company at the Rate of 50% [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	2.00%
Capital Accumulation Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount		$ 1,000,000	$ 0
Defined Contribution Plan, Expected Contributions In Current Fiscal Year		900,000
Defined Benefit Plan, Contributions by Employer		3,900,000
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year		$ 1,300,000