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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	May 03, 2021	Jul. 01, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Business Combination, Acquisition Related Costs			$ 800	$ 600	$ 10,000	$ 3,900
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain					33,406	(0)
Goodwill, Ending Balance			944,871		944,871		$ 430,543
Amortization of Intangible Assets, Total			23,300	$ 11,600	52,800	$ 33,900
Hargray [Member]
Business Acquisition, Percentage of Voting Interests Acquired	85.00%
Payments to Acquire Businesses, Gross	$ 2,000,000
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination, Total	2,200,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value	$ 146,600
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage	15.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	$ 33,400
Business Combination, Step Acquisition, Equity Interest in Acquiree, Carrying Value	$ 113,200
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)	13 years 6 months
Goodwill, Ending Balance	$ 514,328
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual			78,400		129,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual			6,000		10,400
Amortization of Intangible Assets, Total			$ 12,800		$ 21,300
Valu-Net [Member]
Payments to Acquire Businesses, Gross		$ 38,900

X

- Definition

Carrying value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

+ References

No definition available.

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- 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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

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X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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- Definition

Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination.

+ References

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- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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- Definition

Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

+ References

No definition available.

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- Definition

In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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