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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.

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