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Note 2 - Acquisitions - Identifiable Intangible Assets Acquired (Details) - USD ($) $ in Millions			9 Months Ended
	May 03, 2021	Jul. 01, 2020	Sep. 30, 2021
Hargray [Member]
Useful Life (Year)	13 years 6 months
Hargray [Member] | Franchise Rights [Member]
Fair Value			$ 1,110.0
Valu-Net [Member] | Trademarks and Trade Names 1 [Member]
Fair Value		$ 0.8
Valu-Net [Member] | Franchise Rights [Member]
Fair Value		11.2
Customer Relationships [Member] | Hargray [Member]
Fair Value			$ 472.0
Useful Life (Year)			13 years 8 months 12 days
Customer Relationships [Member] | Valu-Net [Member]
Fair Value		$ 7.7
Useful Life (Year)		13 years 6 months
Trademarks and Trade Names [Member] | Hargray [Member]
Fair Value			$ 10.0
Useful Life (Year)			4 years 2 months 12 days

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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X

- Definition

Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472

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X

- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=123455525&loc=d3e2207-128464

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