XML 90 R75.htm IDEA: XBRL DOCUMENT
v3.20.4

Note 11 - Retirement Plans - Target Asset Allocation (Details) | Dec. 31, 2020
--- | ---
Large Cap Value [Member] |
Target range | 5.00%
Large Cap Value [Member] | Minimum [Member] |
Target range | 0.00%
Large Cap Value [Member] | Maximum [Member] |
Target range | 50.00%
Large Cap Blend [Member] |
Target range | 5.00%
Large Cap Blend [Member] | Minimum [Member] |
Target range | 0.00%
Large Cap Blend [Member] | Maximum [Member] |
Target range | 50.00%
Large Cap Growth [Member] |
Target range | 5.00%
Large Cap Growth [Member] | Minimum [Member] |
Target range | 0.00%
Large Cap Growth [Member] | Maximum [Member] |
Target range | 50.00%
Mid-cap Blend [Member] |
Target range | 15.00%
Mid-cap Blend [Member] | Minimum [Member] |
Target range | 0.00%
Mid-cap Blend [Member] | Maximum [Member] |
Target range | 40.00%
Small Cap Core [Member] |
Target range | 5.00%
Small Cap Core [Member] | Minimum [Member] |
Target range | 0.00%
Small Cap Core [Member] | Maximum [Member] |
Target range | 25.00%
Foreign Large Blend [Member] |
Target range | 10.00%
Foreign Large Blend [Member] | Minimum [Member] |
Target range | 0.00%
Foreign Large Blend [Member] | Maximum [Member] |
Target range | 40.00%
Emerging Markets [Member] |
Target range | 10.00%
Emerging Markets [Member] | Minimum [Member] |
Target range | 0.00%
Emerging Markets [Member] | Maximum [Member] |
Target range | 25.00%
Real Estate [Member] |
Target range | 5.00%
Real Estate [Member] | Minimum [Member] |
Target range | 0.00%
Real Estate [Member] | Maximum [Member] |
Target range | 20.00%
US Treasury Securities [Member] |
Target range | 5.00%
US Treasury Securities [Member] | Minimum [Member] |
Target range | 0.00%
US Treasury Securities [Member] | Maximum [Member] |
Target range | 25.00%
Intermediate Term Bond [Member] |
Target range | 10.00%
Intermediate Term Bond [Member] | Minimum [Member] |
Target range | 0.00%
Intermediate Term Bond [Member] | Maximum [Member] |
Target range | 50.00%
US Government Agencies Debt Securities [Member] |
Target range | 5.00%
US Government Agencies Debt Securities [Member] | Minimum [Member] |
Target range | 0.00%
US Government Agencies Debt Securities [Member] | Maximum [Member] |
Target range | 40.00%
High Yield Bond [Member] |
Target range | 10.00%
High Yield Bond [Member] | Minimum [Member] |
Target range | 0.00%
High Yield Bond [Member] | Maximum [Member] |
Target range | 25.00%
Emerging Markets Bond [Member] |
Target range | 10.00%
Emerging Markets Bond [Member] | Minimum [Member] |
Target range | 0.00%
Emerging Markets Bond [Member] | Maximum [Member] |
Target range | 20.00%
Money Market Funds [Member] |
Target range | 0.00%
Money Market Funds [Member] | Minimum [Member] |
Target range | 0.00%
Money Market Funds [Member] | Maximum [Member] |
Target range | 100.00%

X
- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gtn_LargeCapValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gtn_LargeCapBlendMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gtn_LargeCapGrowthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gtn_MidCapBlendMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gtn_SmallCapCoreMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gtn_ForeignLargeBlendMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gtn_EmergingMarketsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_RealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gtn_IntermediateTermBondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gtn_HighYieldBondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gtn_EmergingMarketsBondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |