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Note 11 - Retirement Plans (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Common Stock, Capital Shares Reserved for Future Issuance | 6,130,944 | 7,078,916 |
Pension Plan [Member] | Gray Pension Plan [Member] |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation | $ 135 | $ 117 |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 3 |  |
Capital Accumulation Plan [Member] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | 11 | 6 | $ 7
Defined Contribution Plan, Expected Contributions In Next Twelve Months | $ 12 |  |
Common Stock, Capital Shares Reserved for Future Issuance | 1,391,210 |  |
Capital Accumulation Plan [Member] | First 3% of Each Employee's Salary Deferral [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 100.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 1.00% |  |
Capital Accumulation Plan [Member] | Next 2% of Each Employee's Salary Deferral [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 5.00% |  |
Profit Sharing Contribution [Member] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 5 | $ 4 | $ 4

X
- Definition Amount of the employer's best estimate of contributions expected to be paid to the plan in the next twelve months. + References No definition available. + Details
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Namespace Prefix: | gtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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Balance Type: | credit
Period Type: | instant

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
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X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Balance Type: | debit
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X
- 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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X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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