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Note 3 - Revenues - Revenues by Product Line (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenues $ 424,718 $ 430,237 $ 1,280,528 $ 1,173,248
Deferred commission amortization 1,282 1,318 3,799 4,051
Data [Member]        
Revenues 233,834 219,942 697,317 611,196
Video [Member]        
Revenues 80,525 89,507 249,944 252,764
Voice [Member]        
Revenues 10,494 12,645 33,105 35,235
Business Services [Member]        
Revenues 75,847 85,728 228,999 222,706
Product and Service, Other [Member]        
Revenues 24,018 22,415 71,163 51,347
Fees Imposed by Various Governmental Authorities Passed Through to Customer [Member]        
Revenues $ 7,796 $ 8,683 $ 23,852 $ 22,945