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Note 3 - Acquisitions (Details Textual) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Apr. 29, 2021
Quincy Television Stations in Seven Markets [Member] | Subsequent Event [Member] |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  | $ 380
The 2020 Acquisitions [Member] |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 24 |
The 2020 Acquisitions [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 3 years |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  | 1 year |  |
The 2020 Acquisitions [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 40 years |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  | 4 years |  |
Quincy [Member] |  |  |  |
Payments to Acquire Businesses, Gross | $ 925 |  |  |
Business Combination, Consideration Transferred, Total | 925 |  |  |
Business Acquisition, Termination Option, Fee | $ 25 |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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