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Note 7 - Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 01, 2022
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Goodwill, Ending Balance   $ 928,947     $ 928,947   $ 967,913
Goodwill, Impairment Loss         0    
Amortization of Intangible Assets   $ 20,800   $ 23,300 62,400 $ 52,800  
Clearwave [Member]              
Goodwill, Period Increase (Decrease), Total $ (39,900)   $ 1,800        
Intangible Assets, Period Increase (Decrease)         173,000    
Clearwave [Member] | Customer Relationships [Member]              
Intangible Assets, Period Increase (Decrease)     (4,000)   (59,700)    
Clearwave [Member] | Trademarks [Member]              
Intangible Assets, Period Increase (Decrease)     (200)   (8,100)    
Clearwave [Member] | Trade Names [Member]              
Intangible Assets, Period Increase (Decrease)     (11,000)   $ (27,700)    
Hargray [Member]              
Goodwill, Period Increase (Decrease), Total     $ 2,700