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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).