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Note 6 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Goodwill, Ending Balance $ 116,304   $ 116,304
Goodwill, Impairment Loss $ 0 $ 0  
Minimum [Member]      
Finite-Lived Intangible Asset, Useful Life (Year) 2 years    
Maximum [Member]      
Finite-Lived Intangible Asset, Useful Life (Year) 15 years    
Fiber Internet Services [Member]      
Goodwill, Ending Balance $ 8,600    
Goodwill Percentage Related to Operating Segments 7.00%    
Mobile Services [Member]      
Goodwill, Ending Balance $ 0    
Goodwill Percentage Related to Operating Segments 0.00%    
Domain Services Operating Segment [Member]      
Goodwill, Ending Balance $ 107,700    
Goodwill Percentage Related to Operating Segments 93.00%