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Note 8 - Retirement Plans (Details Textual) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Stock Issued During Period, Value, Employee Benefit Plan | $ 4,000
Common Stock [Member] |
Stock Issued During Period, Value, Employee Benefit Plan | 4,000
Capital Accumulation Plan [Member] |
Defined Contribution Plan, Employer Discretionary Contribution Amount | 3,000
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 13,000
Capital Accumulation Plan [Member] | Common Stock [Member] |
Stock Issued During Period, Value, Employee Benefit Plan | 4,000
Pension Plan [Member] | Gray Pension Plan [Member] |
Defined Contribution Plan, Employer Discretionary Contribution Amount | 0
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | $ 2,000

X
- Definition Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=gtn_CapitalAccumulationPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=gtn_GrayPensionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |