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Note 3 - Property and Equipment (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment, Gross $ 487,791 $ 456,316  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 156,742 116,672  
Asset Impairment Charges 19,100    
Impairment of Long-Lived Assets to be Disposed of 17,726 0 $ 0
Cost of Revenue Property and Equipment Impairment 1,441 4,822 92
Property, Plant and Equipment, Fully Depreciated Writedown   4,800 $ 100
Fiber Network [Member]      
Property, Plant and Equipment, Gross [1] 272,959 215,205  
Fiber Network [Member] | Greenwood Village Fiber-to-the-premises Grant [Member]      
Property, Plant and Equipment, Gross 1,600 0  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 100 0  
Asset under Construction [Member]      
Property, Plant and Equipment, Gross 25,810 $ 75,519  
Impaired Assets to be Disposed of by Method Other than Sale, Carrying Value of Asset 33,600    
Property, Plant, and Equipment, Salvage Value $ 15,900    
[1] Fiber network is presented net of $1.6 million government grants (2023: nil), with an impact of $0.1 million on accumulated depreciation (2023: nil).