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Note 3 - Revenues - Revenues by Product Line (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenues $ 430,237 $ 338,962 $ 1,173,248 $ 988,461
Deferred commission amortization 1,318 1,343 4,051 4,042
Data [Member]        
Revenues 219,942 174,527 611,196 493,532
Video [Member]        
Revenues 89,507 83,553 252,764 256,203
Voice [Member]        
Revenues 12,645 11,490 35,235 36,038
Business Services [Member]        
Revenues 85,728 59,441 222,706 175,771
Product and Service, Other [Member]        
Revenues 22,415 9,951 51,347 26,917
Fees Imposed by Various Governmental Authorities Passed Through to Customer [Member]        
Revenues $ 8,683 $ 6,298 $ 22,945 $ 19,261