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Note 4 - Operating Assets and Liabilities (Details Textual) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
		May 03, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Accounts Receivable, Credit Loss Expense (Reversal)	[1]		$ 2,190	$ (796)	$ 4,812	$ 7,278
Call Option [Member] | MBI Net Option [Member]
Derivative Asset, Fair Value, Gross Liability			16,000		16,000		$ 700
Put Option [Member] | MBI Net Option [Member]
Derivative Asset, Fair Value, Gross Liability			$ 98,700		$ 98,700		$ 74,000
Hargray [Member]
Accounts Receivable, Credit Loss Expense (Reversal)		$ 1,400
[1] Includes $1.4 million of additional reserves assumed in the Hargray Acquisition.

X

- Definition

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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