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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

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