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Note 2 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 30, 2021
May 03, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Oct. 01, 2020
Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, before Accumulated Amortization     $ 300 $ 800 $ 300 $ 800    
Business Combination, Acquisition Related Costs         2,800 10,000    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain     0 $ 0 (0) $ 33,406    
Goodwill, Ending Balance     928,947   928,947   $ 967,913  
Cable America Missouri, LLC [Member]                
Payments to Acquire Businesses, Gross $ 113,100              
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year) 13 years 8 months 12 days              
Business Acquisition, Goodwill, Expected Tax Deductible Amount $ 25,600              
Hargray [Member]                
Payments to Acquire Businesses, Gross   $ 2,000,000            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)   13 years 6 months            
Business Acquisition, Percentage of Voting Interests Acquired   85.00%           15.00%
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination, Total   $ 2,200,000            
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value   $ 146,600            
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage   15.00%            
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain   $ 33,400            
Business Combination, Step Acquisition, Equity Interest in Acquiree, Carrying Value   $ 113,200            
Goodwill, Ending Balance     $ 514,500   $ 514,500