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Note 2 - Acquisitions - Unaudited Pro Forma Combined Results of Operations Information (Details) - Hargray [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues	$ 430,237	$ 401,855	$ 1,276,146	$ 1,173,810
Net income	$ 52,255	$ 58,383	$ 165,898	$ 169,805
Basic (in dollars per share)	$ 8.68	$ 9.73	$ 27.58	$ 29.46
Diluted (in dollars per share)	$ 8.33	$ 9.29	$ 26.24	$ 28.04
Depreciation and amortization	$ 0	$ (3,387)	$ (6,152)	$ (9,882)
Interest expense	0	(511)	(2,867)	(20,221)
Acquisition costs	0	0	(15,403)	0
Gain on step acquisition	0	0	(33,400)	0
Income tax provision	$ 0	$ 975	$ 35,593	$ 7,526
Weighted average common shares outstanding - diluted (in shares)	0	404,248	95,219	404,248

X

- Definition

The pro forma adjustments for acquisition costs for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

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- Definition

The pro forma adjustments for depreciation and amortization for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

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- Definition

The pro forma adjustments for gain on step acquisition for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

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- Definition

The pro forma adjustments for income tax provision for a period as if the business combination or combinations had been completed at the beginning of the period.

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No definition available.

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- Definition

The pro forma adjustments for interest expense for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

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- Definition

The pro forma adjustments for weighted average common shares outstanding, diluted, as if the business combination or combinations had been completed at the beginning of the period.

+ References

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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-Publisher FASB
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- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-Subparagraph (h)(3)
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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