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Note 5 - Property and Equipment (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization |  | $ 418,584 |  | $ 415,506
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment |  | 143,041 |  | 133,551
Asset, Impairment Loss |  | 300 | $ 200 |
Fiber Network [Member] |  |  |  |
Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization | [1] | 272,875 |  | 272,713
Fiber Network [Member] | Greenwood Village Fiber-to-the-premises Grant [Member] |  |  |  |
Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization |  | 200 |  | 100
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment |  | $ 100 |  | $ 100
[1] | Fiber network is presented net of $0.1 million government grants (2024: $1.6 million), with an impact of $0.1 million on accumulated depreciation (2024: $0.1 million).

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